661774074 has 16 divisors (see below), whose sum is σ = 1425359712. Its totient is φ = 203622768.

The previous prime is 661774067. The next prime is 661774093. The reversal of 661774074 is 470477166.

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, 4242064 + ... + 4242219.

It is an arithmetic number, because the mean of its divisors is an integer number (89084982).

Almost surely, 2^661774074 is an apocalyptic number.

661774074 is an abundant number, since it is smaller than the sum of its proper divisors (763585638).

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

661774074 is a wasteful number, since it uses less digits than its factorization.

661774074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484301.

The product of its (nonzero) digits is 197568, while the sum is 42.

The square root of 661774074 is about 25724.9698542097. The cubic root of 661774074 is about 871.4381788040.

The spelling of 661774074 in words is "six hundred sixty-one million, seven hundred seventy-four thousand, seventy-four".