61406440020 has 72 divisors (see below), whose sum is σ = 186539292576. Its totient is φ = 16351042752.

The previous prime is 61406440003. The next prime is 61406440031. The reversal of 61406440020 is 2004460416.

61406440020 is a `hidden beast` number, since 6 + 14 + 0 + 644 + 0 + 0 + 2 + 0 = 666.

61406440020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126802 + ... + 372681.

It is an arithmetic number, because the mean of its divisors is an integer number (2590823508).

Almost surely, 2^61406440020 is an apocalyptic number.

61406440020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61406440020 is an abundant number, since it is smaller than the sum of its proper divisors (125132852556).

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

61406440020 is a wasteful number, since it uses less digits than its factorization.

61406440020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500181 (or 500176 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 61406440020 in words is "sixty-one billion, four hundred six million, four hundred forty thousand, twenty".