77725775025 has 72 divisors (see below), whose sum is σ = 140725407680. Its totient is φ = 41005077120.

The previous prime is 77725774999. The next prime is 77725775059. The reversal of 77725775025 is 52057752777.

It is not a de Polignac number, because 77725775025 - 2¹¹ = 77725772977 is a prime.

It is a super-2 number, since 2×77725775025² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 33115902 + ... + 33118248.

Almost surely, 2^77725775025 is an apocalyptic number.

77725775025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77725775025 is a deficient number, since it is larger than the sum of its proper divisors (62999632655).

77725775025 is a wasteful number, since it uses less digits than its factorization.

77725775025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895 (or 3887 counting only the distinct ones).

The product of its (nonzero) digits is 8403500, while the sum is 54.

The spelling of 77725775025 in words is "seventy-seven billion, seven hundred twenty-five million, seven hundred seventy-five thousand, twenty-five".