77494867641 has 15 divisors (see below), whose sum is σ = 115767680853. Its totient is φ = 51661574820.

The previous prime is 77494867621. The next prime is 77494867649. The reversal of 77494867641 is 14676849477.

The square root of 77494867641 is 278379.

It is a perfect power (a square), and thus also a powerful number.

77494867641 is a `hidden beast` number, since 7 + 7 + 49 + 486 + 76 + 41 = 666.

It is not a de Polignac number, because 77494867641 - 2⁹ = 77494867129 is a prime.

It is a super-2 number, since 2×77494867641² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77494867649) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2489946 + ... + 2520876.

Almost surely, 2^77494867641 is an apocalyptic number.

77494867641 is the 278379-th square number.

77494867641 is the 139190-th centered octagonal number.

It is an amenable number.

77494867641 is a deficient number, since it is larger than the sum of its proper divisors (38272813212).

77494867641 is an frugal number, since it uses more digits than its factorization.

77494867641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61874 (or 30934 counting only the distinct ones).

The product of its digits is 56899584, while the sum is 63.

The spelling of 77494867641 in words is "seventy-seven billion, four hundred ninety-four million, eight hundred sixty-seven thousand, six hundred forty-one".