61799557 has 4 divisors (see below), whose sum is σ = 63236800. Its totient is φ = 60362316.

The previous prime is 61799503. The next prime is 61799561. The reversal of 61799557 is 75599716.

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 61799557 - 2²³ = 53410949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61799557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61799057) 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, 718557 + ... + 718642.

It is an arithmetic number, because the mean of its divisors is an integer number (15809200).

Almost surely, 2^61799557 is an apocalyptic number.

It is an amenable number.

61799557 is a deficient number, since it is larger than the sum of its proper divisors (1437243).

61799557 is a wasteful number, since it uses less digits than its factorization.

61799557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437242.

The product of its digits is 595350, while the sum is 49.

The square root of 61799557 is about 7861.2694267529. The cubic root of 61799557 is about 395.3621780965.

The spelling of 61799557 in words is "sixty-one million, seven hundred ninety-nine thousand, five hundred fifty-seven".