661934490 has 64 divisors (see below), whose sum is σ = 1849879296. Its totient is φ = 148442112.

The previous prime is 661934447. The next prime is 661934513. The reversal of 661934490 is 94439166.

661934490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18607 + ... + 40866.

It is an arithmetic number, because the mean of its divisors is an integer number (28904364).

Almost surely, 2^661934490 is an apocalyptic number.

661934490 is an abundant number, since it is smaller than the sum of its proper divisors (1187944806).

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

661934490 is a wasteful number, since it uses less digits than its factorization.

661934490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59543.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 661934490 is about 25728.0875698137. The cubic root of 661934490 is about 871.5085861824.

The spelling of 661934490 in words is "six hundred sixty-one million, nine hundred thirty-four thousand, four hundred ninety".