61516352657 has 4 divisors (see below), whose sum is σ = 61516861680. Its totient is φ = 61515843636.

The previous prime is 61516352641. The next prime is 61516352671. The reversal of 61516352657 is 75625361516.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61516352657 - 2⁴ = 61516352641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61516352057) 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, 41618 + ... + 353220.

It is an arithmetic number, because the mean of its divisors is an integer number (15379215420).

Almost surely, 2^61516352657 is an apocalyptic number.

It is an amenable number.

61516352657 is a deficient number, since it is larger than the sum of its proper divisors (509023).

61516352657 is a wasteful number, since it uses less digits than its factorization.

61516352657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509022.

The product of its digits is 1134000, while the sum is 47.

The spelling of 61516352657 in words is "sixty-one billion, five hundred sixteen million, three hundred fifty-two thousand, six hundred fifty-seven".