661273074 has 96 divisors (see below), whose sum is σ = 1880386560. Its totient is φ = 162712800.

The previous prime is 661273061. The next prime is 661273099. The reversal of 661273074 is 470372166.

661273074 is a `hidden beast` number, since 6 + 612 + 7 + 30 + 7 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13779 + ... + 38889.

It is an arithmetic number, because the mean of its divisors is an integer number (19587360).

Almost surely, 2^661273074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661273074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940193280).

661273074 is an abundant number, since it is smaller than the sum of its proper divisors (1219113486).

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

661273074 is a wasteful number, since it uses less digits than its factorization.

661273074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25156 (or 25153 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 661273074 is about 25715.2303897904. The cubic root of 661273074 is about 871.2182141335.

The spelling of 661273074 in words is "six hundred sixty-one million, two hundred seventy-three thousand, seventy-four".