661629052 has 48 divisors (see below), whose sum is σ = 1403474688. Its totient is φ = 266423040.

The previous prime is 661629047. The next prime is 661629061. The reversal of 661629052 is 250926166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556803 + ... + 557989.

It is an arithmetic number, because the mean of its divisors is an integer number (29239056).

Almost surely, 2^661629052 is an apocalyptic number.

It is an amenable number.

661629052 is an abundant number, since it is smaller than the sum of its proper divisors (741845636).

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

661629052 is a wasteful number, since it uses less digits than its factorization.

661629052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2384 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 661629052 is about 25722.1509987015. The cubic root of 661629052 is about 871.3745181353.

The spelling of 661629052 in words is "six hundred sixty-one million, six hundred twenty-nine thousand, fifty-two".