77721573151 has 16 divisors (see below), whose sum is σ = 80446279680. Its totient is φ = 75010779360.

The previous prime is 77721573101. The next prime is 77721573179. The reversal of 77721573151 is 15137512777.

It is a happy number.

It is not a de Polignac number, because 77721573151 - 2⁹ = 77721572639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77721573101) 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, 21996981 + ... + 22000513.

It is an arithmetic number, because the mean of its divisors is an integer number (5027892480).

Almost surely, 2^77721573151 is an apocalyptic number.

77721573151 is a deficient number, since it is larger than the sum of its proper divisors (2724706529).

77721573151 is a wasteful number, since it uses less digits than its factorization.

77721573151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286.

The product of its digits is 360150, while the sum is 46.

The spelling of 77721573151 in words is "seventy-seven billion, seven hundred twenty-one million, five hundred seventy-three thousand, one hundred fifty-one".