661608182270 has 32 divisors (see below), whose sum is σ = 1375053720768. Its totient is φ = 224498562048.

The previous prime is 661608182231. The next prime is 661608182281. The reversal of 661608182270 is 72281806166.

It is a super-2 number, since 2×661608182270² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48712517 + ... + 48726096.

It is an arithmetic number, because the mean of its divisors is an integer number (42970428774).

Almost surely, 2^661608182270 is an apocalyptic number.

661608182270 is an abundant number, since it is smaller than the sum of its proper divisors (713445538498).

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

661608182270 is a wasteful number, since it uses less digits than its factorization.

661608182270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97438724.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 661608182270 in words is "six hundred sixty-one billion, six hundred eight million, one hundred eighty-two thousand, two hundred seventy".