61157818 has 16 divisors (see below), whose sum is σ = 94731264. Its totient is φ = 29589840.

The previous prime is 61157797. The next prime is 61157843. The reversal of 61157818 is 81875116.

It is a super-2 number, since 2×61157818² = 7480557405042248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11971 + ... + 16297.

It is an arithmetic number, because the mean of its divisors is an integer number (5920704).

Almost surely, 2^61157818 is an apocalyptic number.

61157818 is a deficient number, since it is larger than the sum of its proper divisors (33573446).

61157818 is a wasteful number, since it uses less digits than its factorization.

61157818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4557.

The product of its digits is 13440, while the sum is 37.

The square root of 61157818 is about 7820.3464117646. The cubic root of 61157818 is about 393.9889068999.

The spelling of 61157818 in words is "sixty-one million, one hundred fifty-seven thousand, eight hundred eighteen".