661413962144 has 24 divisors (see below), whose sum is σ = 1402324795620. Its totient is φ = 305267982336.

The previous prime is 661413962119. The next prime is 661413962149. The reversal of 661413962144 is 441269314166.

It can be written as a sum of positive squares in 2 ways, for example, as 476668729744 + 184745232400 = 690412^2 + 429820^2 .

It is not an unprimeable number, because it can be changed into a prime (661413962149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794968289 + ... + 794969120.

Almost surely, 2^661413962144 is an apocalyptic number.

It is an amenable number.

661413962144 is an abundant number, since it is smaller than the sum of its proper divisors (740910833476).

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

661413962144 is a wasteful number, since it uses less digits than its factorization.

661413962144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589937432 (or 1589937424 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The spelling of 661413962144 in words is "six hundred sixty-one billion, four hundred thirteen million, nine hundred sixty-two thousand, one hundred forty-four".