77655725025 has 24 divisors (see below), whose sum is σ = 135943200864. Its totient is φ = 38980128000.

The previous prime is 77655725003. The next prime is 77655725051. The reversal of 77655725025 is 52052755677.

It is a happy number.

It is not a de Polignac number, because 77655725025 - 2¹⁰ = 77655724001 is a prime.

It is a super-2 number, since 2×77655725025² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 30451951 + ... + 30454500.

It is an arithmetic number, because the mean of its divisors is an integer number (5664300036).

Almost surely, 2^77655725025 is an apocalyptic number.

77655725025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77655725025 is a deficient number, since it is larger than the sum of its proper divisors (58287475839).

77655725025 is a wasteful number, since it uses less digits than its factorization.

77655725025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60906481 (or 60906476 counting only the distinct ones).

The product of its (nonzero) digits is 5145000, while the sum is 51.

The spelling of 77655725025 in words is "seventy-seven billion, six hundred fifty-five million, seven hundred twenty-five thousand, twenty-five".