661011655150 has 96 divisors (see below), whose sum is σ = 1585717793280. Its totient is φ = 198925104000.

The previous prime is 661011655111. The next prime is 661011655169. The reversal of 661011655150 is 51556110166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2848546 + ... + 3071845.

It is an arithmetic number, because the mean of its divisors is an integer number (16517893680).

Almost surely, 2^661011655150 is an apocalyptic number.

661011655150 is an abundant number, since it is smaller than the sum of its proper divisors (924706138130).

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

661011655150 is a wasteful number, since it uses less digits than its factorization.

661011655150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5920450 (or 5920445 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 661011655150 in words is "six hundred sixty-one billion, eleven million, six hundred fifty-five thousand, one hundred fifty".