661939030 has 16 divisors (see below), whose sum is σ = 1261578240. Its totient is φ = 249200512.

The previous prime is 661939021. The next prime is 661939067. The reversal of 661939030 is 30939166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1946710 + ... + 1947049.

It is an arithmetic number, because the mean of its divisors is an integer number (78848640).

Almost surely, 2^661939030 is an apocalyptic number.

661939030 is a deficient number, since it is larger than the sum of its proper divisors (599639210).

661939030 is a wasteful number, since it uses less digits than its factorization.

661939030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3893783.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 661939030 is about 25728.1758000835. The cubic root of 661939030 is about 871.5105786454.

The spelling of 661939030 in words is "six hundred sixty-one million, nine hundred thirty-nine thousand, thirty".