61516352757 has 4 divisors (see below), whose sum is σ = 82021803680. Its totient is φ = 41010901836.

The previous prime is 61516352741. The next prime is 61516352789. The reversal of 61516352757 is 75725361516.

61516352757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61516352757 - 2⁴ = 61516352741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61516352707) 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, 10252725457 + ... + 10252725462.

It is an arithmetic number, because the mean of its divisors is an integer number (20505450920).

Almost surely, 2^61516352757 is an apocalyptic number.

It is an amenable number.

61516352757 is a deficient number, since it is larger than the sum of its proper divisors (20505450923).

61516352757 is a wasteful number, since it uses less digits than its factorization.

61516352757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20505450922.

The product of its digits is 1323000, while the sum is 48.

The spelling of 61516352757 in words is "sixty-one billion, five hundred sixteen million, three hundred fifty-two thousand, seven hundred fifty-seven".