641397534777 has 64 divisors (see below), whose sum is σ = 986358700800. Its totient is φ = 411662684160.

The previous prime is 641397534761. The next prime is 641397534793. The reversal of 641397534777 is 777435793146.

641397534777 is a `hidden beast` number, since 6 + 4 + 1 + 3 + 97 + 534 + 7 + 7 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (641397534761) and next prime (641397534793).

It is not a de Polignac number, because 641397534777 - 2⁴ = 641397534761 is a prime.

It is a super-2 number, since 2×641397534777² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641397534737) 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, 24410827 + ... + 24437087.

It is an arithmetic number, because the mean of its divisors is an integer number (15411854700).

Almost surely, 2^641397534777 is an apocalyptic number.

It is an amenable number.

641397534777 is a deficient number, since it is larger than the sum of its proper divisors (344961166023).

641397534777 is a wasteful number, since it uses less digits than its factorization.

641397534777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26615 (or 26609 counting only the distinct ones).

The product of its digits is 93350880, while the sum is 63.

The spelling of 641397534777 in words is "six hundred forty-one billion, three hundred ninety-seven million, five hundred thirty-four thousand, seven hundred seventy-seven".