61561633156145 has 16 divisors (see below), whose sum is σ = 73927831680000. Its totient is φ = 49213394288448.

The previous prime is 61561633156129. The next prime is 61561633156157. The reversal of 61561633156145 is 54165133616516.

It is a cyclic number.

It is not a de Polignac number, because 61561633156145 - 2⁴ = 61561633156129 is a prime.

It is a super-2 number, since 2×61561633156145² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236146331 + ... + 236406879.

It is an arithmetic number, because the mean of its divisors is an integer number (4620489480000).

Almost surely, 2^{61561633156145} is an apocalyptic number.

It is an amenable number.

61561633156145 is a deficient number, since it is larger than the sum of its proper divisors (12366198523855).

61561633156145 is a wasteful number, since it uses less digits than its factorization.

61561633156145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294832.

The product of its digits is 5832000, while the sum is 53.

The spelling of 61561633156145 in words is "sixty-one trillion, five hundred sixty-one billion, six hundred thirty-three million, one hundred fifty-six thousand, one hundred forty-five".