78628551677651 has 16 divisors (see below), whose sum is σ = 82183397796864. Its totient is φ = 75085115528544.

The previous prime is 78628551677593. The next prime is 78628551677677. The reversal of 78628551677651 is 15677615582687.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78628551677651 - 2³⁴ = 78611371808467 is a prime.

It is a super-2 number, since 2×78628551677651² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78628551677251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58308341 + ... + 59641593.

It is an arithmetic number, because the mean of its divisors is an integer number (5136462362304).

Almost surely, 2^{78628551677651} is an apocalyptic number.

78628551677651 is a deficient number, since it is larger than the sum of its proper divisors (3554846119213).

78628551677651 is a wasteful number, since it uses less digits than its factorization.

78628551677651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337530.

The product of its digits is 1185408000, while the sum is 74.

The spelling of 78628551677651 in words is "seventy-eight trillion, six hundred twenty-eight billion, five hundred fifty-one million, six hundred seventy-seven thousand, six hundred fifty-one".