76156681225 has 27 divisors (see below), whose sum is σ = 95585859327. Its totient is φ = 60191278080.

The previous prime is 76156681207. The next prime is 76156681229. The reversal of 76156681225 is 52218665167.

The square root of 76156681225 is 275965.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 72362614009 + 3794067216 = 269003^2 + 61596^2 .

It is not a de Polignac number, because 76156681225 - 2¹¹ = 76156679177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76156681229) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 133842741 + ... + 133843309.

Almost surely, 2^76156681225 is an apocalyptic number.

76156681225 is the 275965-th square number.

76156681225 is the 137983-rd centered octagonal number.

It is an amenable number.

76156681225 is a deficient number, since it is larger than the sum of its proper divisors (19429178102).

76156681225 is an frugal number, since it uses more digits than its factorization.

76156681225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342 (or 671 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 49.

Multiplying 76156681225 by its sum of digits (49), we get a square (3731677380025 = 1931755²).

The spelling of 76156681225 in words is "seventy-six billion, one hundred fifty-six million, six hundred eighty-one thousand, two hundred twenty-five".