77272027681 has 16 divisors (see below), whose sum is σ = 83399932800. Its totient is φ = 71333420800.

The previous prime is 77272027673. The next prime is 77272027727. The reversal of 77272027681 is 18672027277.

It is a cyclic number.

It is not a de Polignac number, because 77272027681 - 2³ = 77272027673 is a prime.

It is a super-2 number, since 2×77272027681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77272027601) 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, 26581 + ... + 394018.

It is an arithmetic number, because the mean of its divisors is an integer number (5212495800).

Almost surely, 2^77272027681 is an apocalyptic number.

It is an amenable number.

77272027681 is a deficient number, since it is larger than the sum of its proper divisors (6127905119).

77272027681 is a wasteful number, since it uses less digits than its factorization.

77272027681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420824.

The product of its (nonzero) digits is 921984, while the sum is 49.

The spelling of 77272027681 in words is "seventy-seven billion, two hundred seventy-two million, twenty-seven thousand, six hundred eighty-one".