661416425612355 has 16 divisors (see below), whose sum is σ = 1209447178262784. Its totient is φ = 302361794565600.

The previous prime is 661416425612177. The next prime is 661416425612363. The reversal of 661416425612355 is 553216524614166.

It is not a de Polignac number, because 661416425612355 - 2⁸ = 661416425612099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661416425612295 and 661416425612304.

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, 3149602026621 + ... + 3149602026830.

It is an arithmetic number, because the mean of its divisors is an integer number (75590448641424).

Almost surely, 2^{661416425612355} is an apocalyptic number.

661416425612355 is a deficient number, since it is larger than the sum of its proper divisors (548030752650429).

661416425612355 is a wasteful number, since it uses less digits than its factorization.

661416425612355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6299204053466.

The product of its digits is 31104000, while the sum is 57.

The spelling of 661416425612355 in words is "six hundred sixty-one trillion, four hundred sixteen billion, four hundred twenty-five million, six hundred twelve thousand, three hundred fifty-five".