61013649204 has 18 divisors (see below), whose sum is σ = 154228946690. Its totient is φ = 20337883056.

The previous prime is 61013649199. The next prime is 61013649209. The reversal of 61013649204 is 40294631016.

61013649204 is a `hidden beast` number, since 6 + 1 + 0 + 1 + 3 + 649 + 2 + 0 + 4 = 666.

61013649204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61013649199) and next prime (61013649209).

It can be written as a sum of positive squares in only one way, i.e., 45773746704 + 15239902500 = 213948^2 + 123450^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1694823589 = 61013649204 / (6 + 1 + 0 + 1 + 3 + 6 + 4 + 9 + 2 + 0 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61013649209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 847411759 + ... + 847411830.

Almost surely, 2^61013649204 is an apocalyptic number.

It is an amenable number.

61013649204 is an abundant number, since it is smaller than the sum of its proper divisors (93215297486).

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

61013649204 is a wasteful number, since it uses less digits than its factorization.

61013649204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694823599 (or 1694823594 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 61013649204 in words is "sixty-one billion, thirteen million, six hundred forty-nine thousand, two hundred four".