1561660772525 has 24 divisors (see below), whose sum is σ = 2220212552064. Its totient is φ = 1067409806400.

The previous prime is 1561660772491. The next prime is 1561660772533. The reversal of 1561660772525 is 5252770661651.

It is a happy number.

It is not a de Polignac number, because 1561660772525 - 2⁶ = 1561660772461 is a prime.

It is a super-3 number, since 3×1561660772525³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14292482 + ... + 14401331.

It is an arithmetic number, because the mean of its divisors is an integer number (92508856336).

Almost surely, 2^{1561660772525} is an apocalyptic number.

It is an amenable number.

1561660772525 is a deficient number, since it is larger than the sum of its proper divisors (658551779539).

1561660772525 is a wasteful number, since it uses less digits than its factorization.

1561660772525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28694141 (or 28694136 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 53.

The spelling of 1561660772525 in words is "one trillion, five hundred sixty-one billion, six hundred sixty million, seven hundred seventy-two thousand, five hundred twenty-five".