661969893585 has 1152 divisors, whose sum is σ = 1715921141760. Its totient is φ = 213199257600.

The previous prime is 661969893457. The next prime is 661969893617. The reversal of 661969893585 is 585398969166.

It is not a de Polignac number, because 661969893585 - 2⁷ = 661969893457 is a prime.

It is an unprimeable number.

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 1151 ways as a sum of consecutive naturals, for example, 17891078187 + ... + 17891078223.

It is an arithmetic number, because the mean of its divisors is an integer number (1489514880).

Almost surely, 2^661969893585 is an apocalyptic number.

661969893585 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

661969893585 is an abundant number, since it is smaller than the sum of its proper divisors (1053951248175).

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

661969893585 is a wasteful number, since it uses less digits than its factorization.

661969893585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 143 counting only the distinct ones).

The product of its digits is 755827200, while the sum is 75.

The spelling of 661969893585 in words is "six hundred sixty-one billion, nine hundred sixty-nine million, eight hundred ninety-three thousand, five hundred eighty-five".