61645985004 has 48 divisors (see below), whose sum is σ = 154388209248. Its totient is φ = 19074981888.

The previous prime is 61645985003. The next prime is 61645985017. The reversal of 61645985004 is 40058954616.

61645985004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61645985004² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61645985003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2054877 + ... + 2084660.

It is an arithmetic number, because the mean of its divisors is an integer number (3216421026).

Almost surely, 2^61645985004 is an apocalyptic number.

It is an amenable number.

61645985004 is an abundant number, since it is smaller than the sum of its proper divisors (92742224244).

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

61645985004 is a wasteful number, since it uses less digits than its factorization.

61645985004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139634 (or 4139632 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 61645985004 in words is "sixty-one billion, six hundred forty-five million, nine hundred eighty-five thousand, four".