78776846417 has 4 divisors (see below), whose sum is σ = 82201926720. Its totient is φ = 75351766116.

The previous prime is 78776846387. The next prime is 78776846437. The reversal of 78776846417 is 71464867787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78776846417 - 2¹² = 78776842321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78776846437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712540117 + ... + 1712540162.

It is an arithmetic number, because the mean of its divisors is an integer number (20550481680).

Almost surely, 2^78776846417 is an apocalyptic number.

It is an amenable number.

78776846417 is a deficient number, since it is larger than the sum of its proper divisors (3425080303).

78776846417 is a wasteful number, since it uses less digits than its factorization.

78776846417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425080302.

The product of its digits is 88510464, while the sum is 65.

The spelling of 78776846417 in words is "seventy-eight billion, seven hundred seventy-six million, eight hundred forty-six thousand, four hundred seventeen".