661260590019 has 12 divisors (see below), whose sum is σ = 988090537200. Its totient is φ = 425639000304.

The previous prime is 661260589999. The next prime is 661260590033. The reversal of 661260590019 is 910095062166.

It is a happy number.

It is not a de Polignac number, because 661260590019 - 2³⁵ = 626900851651 is a prime.

It is a super-2 number, since 2×661260590019² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661260590519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1266782479 + ... + 1266783000.

It is an arithmetic number, because the mean of its divisors is an integer number (82340878100).

Almost surely, 2^661260590019 is an apocalyptic number.

661260590019 is a deficient number, since it is larger than the sum of its proper divisors (326829947181).

661260590019 is a wasteful number, since it uses less digits than its factorization.

661260590019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533565514 (or 2533565511 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 661260590019 in words is "six hundred sixty-one billion, two hundred sixty million, five hundred ninety thousand, nineteen".