75781831225 has 9 divisors (see below), whose sum is σ = 93971177517. Its totient is φ = 60624363840.

The previous prime is 75781831201. The next prime is 75781831271. The reversal of 75781831225 is 52213818757.

The square root of 75781831225 is 275285.

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

It can be written as a sum of positive squares in 4 ways, for example, as 18754480809 + 57027350416 = 136947^2 + 238804^2 .

It is not a de Polignac number, because 75781831225 - 2¹⁵ = 75781798457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1348897 + ... + 1403953.

Almost surely, 2^75781831225 is an apocalyptic number.

75781831225 is the 275285-th square number.

75781831225 is the 137643-rd centered octagonal number.

It is an amenable number.

75781831225 is a deficient number, since it is larger than the sum of its proper divisors (18189346292).

75781831225 is an frugal number, since it uses more digits than its factorization.

75781831225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110124 (or 55062 counting only the distinct ones).

The product of its digits is 940800, while the sum is 49.

Multiplying 75781831225 by its sum of digits (49), we get a square (3713309730025 = 1926995²).

The spelling of 75781831225 in words is "seventy-five billion, seven hundred eighty-one million, eight hundred thirty-one thousand, two hundred twenty-five".