749615516891 has 2 divisors, whose sum is σ = 749615516892. Its totient is φ = 749615516890.

The previous prime is 749615516857. The next prime is 749615516971. The reversal of 749615516891 is 198615516947.

It is a weak prime.

It is an emirp because it is prime and its reverse (198615516947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 749615516891 - 2²² = 749611322587 is a prime.

It is a super-2 number, since 2×749615516891² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (749615516191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374807758445 + 374807758446.

It is an arithmetic number, because the mean of its divisors is an integer number (374807758446).

Almost surely, 2^749615516891 is an apocalyptic number.

749615516891 is a deficient number, since it is larger than the sum of its proper divisors (1).

749615516891 is an equidigital number, since it uses as much as digits as its factorization.

749615516891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 62.

The spelling of 749615516891 in words is "seven hundred forty-nine billion, six hundred fifteen million, five hundred sixteen thousand, eight hundred ninety-one".