661667052 has 48 divisors (see below), whose sum is σ = 1581304032. Its totient is φ = 215255040.

The previous prime is 661667021. The next prime is 661667053. The reversal of 661667052 is 250766166.

It is a self number, because there is not a number n which added to its sum of digits gives 661667052.

It is not an unprimeable number, because it can be changed into a prime (661667053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122652 + ... + 127932.

It is an arithmetic number, because the mean of its divisors is an integer number (32943834).

Almost surely, 2^661667052 is an apocalyptic number.

It is an amenable number.

661667052 is an abundant number, since it is smaller than the sum of its proper divisors (919636980).

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

661667052 is a wasteful number, since it uses less digits than its factorization.

661667052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538 (or 5536 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 661667052 is about 25722.8896510481. The cubic root of 661667052 is about 871.3911999893.

The spelling of 661667052 in words is "six hundred sixty-one million, six hundred sixty-seven thousand, fifty-two".