77667729925 has 24 divisors (see below), whose sum is σ = 97299154152. Its totient is φ = 61495200000.

The previous prime is 77667729913. The next prime is 77667729941. The reversal of 77667729925 is 52992776677.

It can be written as a sum of positive squares in 12 ways, for example, as 2923997476 + 74743732449 = 54074^2 + 273393^2 .

It is not a de Polignac number, because 77667729925 - 2³³ = 69077795333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9583375 + ... + 9591475.

It is an arithmetic number, because the mean of its divisors is an integer number (4054131423).

Almost surely, 2^77667729925 is an apocalyptic number.

It is an amenable number.

77667729925 is a deficient number, since it is larger than the sum of its proper divisors (19631424227).

77667729925 is a wasteful number, since it uses less digits than its factorization.

77667729925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12009 (or 12004 counting only the distinct ones).

The product of its digits is 140026320, while the sum is 67.

The spelling of 77667729925 in words is "seventy-seven billion, six hundred sixty-seven million, seven hundred twenty-nine thousand, nine hundred twenty-five".