61256436730 has 32 divisors (see below), whose sum is σ = 111534725520. Its totient is φ = 24219824640.

The previous prime is 61256436721. The next prime is 61256436733. The reversal of 61256436730 is 3763465216.

It can be written as a sum of positive squares in 8 ways, for example, as 582401689 + 60674035041 = 24133^2 + 246321^2 .

It is not an unprimeable number, because it can be changed into a prime (61256436733) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3570132 + ... + 3587248.

Almost surely, 2^61256436730 is an apocalyptic number.

61256436730 is a deficient number, since it is larger than the sum of its proper divisors (50278288790).

61256436730 is a wasteful number, since it uses less digits than its factorization.

61256436730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21234.

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 61256436730 in words is "sixty-one billion, two hundred fifty-six million, four hundred thirty-six thousand, seven hundred thirty".