61913089407 has 64 divisors (see below), whose sum is σ = 94668062720. Its totient is φ = 35677563264.

The previous prime is 61913089397. The next prime is 61913089409. The reversal of 61913089407 is 70498031916.

It is a happy number.

It is not a de Polignac number, because 61913089407 - 2⁷ = 61913089279 is a prime.

It is a super-2 number, since 2×61913089407² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61913089409) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28889778 + ... + 28891920.

It is an arithmetic number, because the mean of its divisors is an integer number (1479188480).

Almost surely, 2^61913089407 is an apocalyptic number.

61913089407 is a deficient number, since it is larger than the sum of its proper divisors (32754973313).

61913089407 is a wasteful number, since it uses less digits than its factorization.

61913089407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612.

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 61913089407 in words is "sixty-one billion, nine hundred thirteen million, eighty-nine thousand, four hundred seven".