61564220104 has 96 divisors (see below), whose sum is σ = 129384523800. Its totient is φ = 27350630400.

The previous prime is 61564220093. The next prime is 61564220111. The reversal of 61564220104 is 40102246516.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37635224004 + 23928996100 = 193998^2 + 154690^2 .

It is a Harshad number since it is a multiple of its sum of digits (31).

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 23 ways as a sum of consecutive naturals, for example, 5352792 + ... + 5364280.

Almost surely, 2^61564220104 is an apocalyptic number.

It is an amenable number.

61564220104 is an abundant number, since it is smaller than the sum of its proper divisors (67820303696).

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

61564220104 is a wasteful number, since it uses less digits than its factorization.

61564220104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11615 (or 11580 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 61564220104 in words is "sixty-one billion, five hundred sixty-four million, two hundred twenty thousand, one hundred four".