61561665606057 has 16 divisors (see below), whose sum is σ = 82303860122880. Its totient is φ = 40930294972032.

The previous prime is 61561665606053. The next prime is 61561665606079. The reversal of 61561665606057 is 75060656616516.

It is not a de Polignac number, because 61561665606057 - 2² = 61561665606053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61561665606053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60998613 + ... + 61999629.

It is an arithmetic number, because the mean of its divisors is an integer number (5143991257680).

Almost surely, 2^{61561665606057} is an apocalyptic number.

It is an amenable number.

61561665606057 is a deficient number, since it is larger than the sum of its proper divisors (20742194516823).

61561665606057 is a wasteful number, since it uses less digits than its factorization.

61561665606057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056352.

The product of its (nonzero) digits is 40824000, while the sum is 60.

The spelling of 61561665606057 in words is "sixty-one trillion, five hundred sixty-one billion, six hundred sixty-five million, six hundred six thousand, fifty-seven".