61515203125 has 14 divisors (see below), whose sum is σ = 76893039194. Its totient is φ = 49212150000.

The previous prime is 61515203107. The next prime is 61515203131. The reversal of 61515203125 is 52130251516.

It can be written as a sum of positive squares in 7 ways, for example, as 55689392196 + 5825810929 = 235986^2 + 76327^2 .

It is not a de Polignac number, because 61515203125 - 2¹³ = 61515194933 is a prime.

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 (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1952862 + ... + 1984111.

Almost surely, 2^61515203125 is an apocalyptic number.

It is an amenable number.

61515203125 is a deficient number, since it is larger than the sum of its proper divisors (15377836069).

61515203125 is an frugal number, since it uses more digits than its factorization.

61515203125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937003 (or 3936978 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 61515203125 in words is "sixty-one billion, five hundred fifteen million, two hundred three thousand, one hundred twenty-five".