61564135400 has 24 divisors (see below), whose sum is σ = 143136615270. Its totient is φ = 24625654080.

The previous prime is 61564135349. The next prime is 61564135421. The reversal of 61564135400 is 453146516.

It can be written as a sum of positive squares in 3 ways, for example, as 54856197796 + 6707937604 = 234214^2 + 81902^2 .

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 5 ways as a sum of consecutive naturals, for example, 153910139 + ... + 153910538.

Almost surely, 2^61564135400 is an apocalyptic number.

It is an amenable number.

61564135400 is an abundant number, since it is smaller than the sum of its proper divisors (81572479870).

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

61564135400 is a wasteful number, since it uses less digits than its factorization.

61564135400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307820693 (or 307820684 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 61564135400 in words is "sixty-one billion, five hundred sixty-four million, one hundred thirty-five thousand, four hundred".