661015345436160 has 320 divisors, whose sum is σ = 2482621099580160. Its totient is φ = 147919517614080.

The previous prime is 661015345436153. The next prime is 661015345436227. The reversal of 661015345436160 is 61634543510166.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299844790 + ... + 302041269.

It is an arithmetic number, because the mean of its divisors is an integer number (7758190936188).

Almost surely, 2^{661015345436160} is an apocalyptic number.

661015345436160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661015345436160 is an abundant number, since it is smaller than the sum of its proper divisors (1821605754144000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661015345436160 is a wasteful number, since it uses less digits than its factorization.

661015345436160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601886109 (or 601886093 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 661015345436160 in words is "six hundred sixty-one trillion, fifteen billion, three hundred forty-five million, four hundred thirty-six thousand, one hundred sixty".