261664776013370 has 64 divisors (see below), whose sum is σ = 488459626186752. Its totient is φ = 100875598824000.

The previous prime is 261664776013349. The next prime is 261664776013393. The reversal of 261664776013370 is 73310677466162.

It is a happy number.

It is a super-2 number, since 2×261664776013370² (a number of 30 digits) contains 22 as substring.

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, 14763086 + ... + 27226425.

It is an arithmetic number, because the mean of its divisors is an integer number (7632181659168).

Almost surely, 2^{261664776013370} is an apocalyptic number.

261664776013370 is a deficient number, since it is larger than the sum of its proper divisors (226794850173382).

261664776013370 is a wasteful number, since it uses less digits than its factorization.

261664776013370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41989787.

The product of its (nonzero) digits is 32006016, while the sum is 59.

The spelling of 261664776013370 in words is "two hundred sixty-one trillion, six hundred sixty-four billion, seven hundred seventy-six million, thirteen thousand, three hundred seventy".