61920490971 has 32 divisors (see below), whose sum is σ = 89468051200. Its totient is φ = 37959788160.

The previous prime is 61920490937. The next prime is 61920490979. The reversal of 61920490971 is 17909402916.

It is not a de Polignac number, because 61920490971 - 2¹¹ = 61920488923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61920490971.

It is not an unprimeable number, because it can be changed into a prime (61920490979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 853020 + ... + 922758.

It is an arithmetic number, because the mean of its divisors is an integer number (2795876600).

Almost surely, 2^61920490971 is an apocalyptic number.

61920490971 is a deficient number, since it is larger than the sum of its proper divisors (27547560229).

61920490971 is a wasteful number, since it uses less digits than its factorization.

61920490971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70219.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 61920490971 in words is "sixty-one billion, nine hundred twenty million, four hundred ninety thousand, nine hundred seventy-one".