77954427197 has 16 divisors (see below), whose sum is σ = 84913920000. Its totient is φ = 71285590272.

The previous prime is 77954427139. The next prime is 77954427247. The reversal of 77954427197 is 79172445977.

It is not a de Polignac number, because 77954427197 - 2⁸ = 77954426941 is a prime.

It is a super-2 number, since 2×77954427197² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77954427107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327197 + ... + 512802.

It is an arithmetic number, because the mean of its divisors is an integer number (5307120000).

Almost surely, 2^77954427197 is an apocalyptic number.

It is an amenable number.

77954427197 is a deficient number, since it is larger than the sum of its proper divisors (6959492803).

77954427197 is a wasteful number, since it uses less digits than its factorization.

77954427197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840172.

The product of its digits is 31116960, while the sum is 62.

The spelling of 77954427197 in words is "seventy-seven billion, nine hundred fifty-four million, four hundred twenty-seven thousand, one hundred ninety-seven".