61500657 has 4 divisors (see below), whose sum is σ = 82000880. Its totient is φ = 41000436.

The previous prime is 61500629. The next prime is 61500661. The reversal of 61500657 is 75600516.

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 not a de Polignac number, because 61500657 - 2¹¹ = 61498609 is a prime.

It is a super-2 number, since 2×61500657² = 7564661622863298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61500757) 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, 10250107 + ... + 10250112.

It is an arithmetic number, because the mean of its divisors is an integer number (20500220).

Almost surely, 2^61500657 is an apocalyptic number.

It is an amenable number.

61500657 is a deficient number, since it is larger than the sum of its proper divisors (20500223).

61500657 is a wasteful number, since it uses less digits than its factorization.

61500657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20500222.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 61500657 is about 7842.2354593572. The cubic root of 61500657 is about 394.7237442400.

The spelling of 61500657 in words is "sixty-one million, five hundred thousand, six hundred fifty-seven".