61231502500 has 225 divisors, whose sum is σ = 157770529301. Its totient is φ = 20785800000.

The previous prime is 61231502473. The next prime is 61231502551. The reversal of 61231502500 is 520513216.

The square root of 61231502500 is 247450.

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

It can be written as a sum of positive squares in 7 ways, for example, as 13214422116 + 48017080384 = 114954^2 + 219128^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 606252450 + ... + 606252550.

Almost surely, 2^61231502500 is an apocalyptic number.

61231502500 is the 247450-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61231502500

61231502500 is an abundant number, since it is smaller than the sum of its proper divisors (96539026801).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61231502500 is an frugal number, since it uses more digits than its factorization.

61231502500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Multiplying 61231502500 by its sum of digits (25), we get a square (1530787562500 = 1237250²).

61231502500 divided by its sum of digits (25) gives a square (2449260100 = 49490²).

The spelling of 61231502500 in words is "sixty-one billion, two hundred thirty-one million, five hundred two thousand, five hundred".