61655257 has 4 divisors (see below), whose sum is σ = 62098960. Its totient is φ = 61211556.

The previous prime is 61655207. The next prime is 61655317. The reversal of 61655257 is 75255616.

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 61655257 - 2⁷ = 61655129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61655207) 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, 221643 + ... + 221920.

It is an arithmetic number, because the mean of its divisors is an integer number (15524740).

Almost surely, 2^61655257 is an apocalyptic number.

It is an amenable number.

61655257 is a deficient number, since it is larger than the sum of its proper divisors (443703).

61655257 is a wasteful number, since it uses less digits than its factorization.

61655257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443702.

The product of its digits is 63000, while the sum is 37.

The square root of 61655257 is about 7852.0861559206. The cubic root of 61655257 is about 395.0542189100.

The spelling of 61655257 in words is "sixty-one million, six hundred fifty-five thousand, two hundred fifty-seven".