10423156491 has 64 divisors (see below), whose sum is σ = 17826324480. Its totient is φ = 5957028000.

The previous prime is 10423156487. The next prime is 10423156507. The reversal of 10423156491 is 19465132401.

It is a happy number.

10423156491 is a `hidden beast` number, since 1 + 0 + 4 + 2 + 3 + 1 + 5 + 649 + 1 = 666.

It is not a de Polignac number, because 10423156491 - 2² = 10423156487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10423156421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 474256 + ... + 495746.

It is an arithmetic number, because the mean of its divisors is an integer number (278536320).

Almost surely, 2^10423156491 is an apocalyptic number.

10423156491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10423156491 is a deficient number, since it is larger than the sum of its proper divisors (7403167989).

10423156491 is a wasteful number, since it uses less digits than its factorization.

10423156491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21605 (or 21599 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 10423156491 its reverse (19465132401), we get a palindrome (29888288892).

The spelling of 10423156491 in words is "ten billion, four hundred twenty-three million, one hundred fifty-six thousand, four hundred ninety-one".