61500474857 has 4 divisors (see below), whose sum is σ = 61501614720. Its totient is φ = 61499334996.

The previous prime is 61500474803. The next prime is 61500474859. The reversal of 61500474857 is 75847400516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61500474857 - 2⁶ = 61500474793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61500474859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484757 + ... + 598322.

It is an arithmetic number, because the mean of its divisors is an integer number (15375403680).

Almost surely, 2^61500474857 is an apocalyptic number.

It is an amenable number.

61500474857 is a deficient number, since it is larger than the sum of its proper divisors (1139863).

61500474857 is a wasteful number, since it uses less digits than its factorization.

61500474857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139862.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 61500474857 in words is "sixty-one billion, five hundred million, four hundred seventy-four thousand, eight hundred fifty-seven".