76661959725 has 72 divisors (see below), whose sum is σ = 147935609640. Its totient is φ = 37725143040.

The previous prime is 76661959643. The next prime is 76661959729. The reversal of 76661959725 is 52795916667.

It can be written as a sum of positive squares in 12 ways, for example, as 60281543529 + 16380416196 = 245523^2 + 127986^2 .

It is not a de Polignac number, because 76661959725 - 2⁷ = 76661959597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76661959729) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9733389 + ... + 9741261.

It is an arithmetic number, because the mean of its divisors is an integer number (2054661245).

Almost surely, 2^76661959725 is an apocalyptic number.

76661959725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

76661959725 is a deficient number, since it is larger than the sum of its proper divisors (71273649915).

76661959725 is a wasteful number, since it uses less digits than its factorization.

76661959725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11231 (or 11223 counting only the distinct ones).

The product of its digits is 42865200, while the sum is 63.

The spelling of 76661959725 in words is "seventy-six billion, six hundred sixty-one million, nine hundred fifty-nine thousand, seven hundred twenty-five".