77421452525 has 6 divisors (see below), whose sum is σ = 96002601162. Its totient is φ = 61937162000.

The previous prime is 77421452497. The next prime is 77421452533. The reversal of 77421452525 is 52525412477.

It can be written as a sum of positive squares in 3 ways, for example, as 10155399076 + 67266053449 = 100774^2 + 259357^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77421452525 is a prime.

It is a super-2 number, since 2×77421452525² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1548429026 + ... + 1548429075.

It is an arithmetic number, because the mean of its divisors is an integer number (16000433527).

Almost surely, 2^77421452525 is an apocalyptic number.

It is an amenable number.

77421452525 is a deficient number, since it is larger than the sum of its proper divisors (18581148637).

77421452525 is a wasteful number, since it uses less digits than its factorization.

77421452525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096858111 (or 3096858106 counting only the distinct ones).

The product of its digits is 784000, while the sum is 44.

The spelling of 77421452525 in words is "seventy-seven billion, four hundred twenty-one million, four hundred fifty-two thousand, five hundred twenty-five".