77438615381 has 8 divisors (see below), whose sum is σ = 84143827200. Its totient is φ = 70996353120.

The previous prime is 77438615369. The next prime is 77438615437. The reversal of 77438615381 is 18351683477.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77438615381 is a prime.

It is a super-2 number, since 2×77438615381² (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 (77438615281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65736776 + ... + 65737953.

It is an arithmetic number, because the mean of its divisors is an integer number (10517978400).

Almost surely, 2^77438615381 is an apocalyptic number.

It is an amenable number.

77438615381 is a deficient number, since it is larger than the sum of its proper divisors (6705211819).

77438615381 is a wasteful number, since it uses less digits than its factorization.

77438615381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131474779.

The product of its digits is 3386880, while the sum is 53.

The spelling of 77438615381 in words is "seventy-seven billion, four hundred thirty-eight million, six hundred fifteen thousand, three hundred eighty-one".