66121944 has 32 divisors (see below), whose sum is σ = 188920320. Its totient is φ = 18891936.

The previous prime is 66121933. The next prime is 66121961. The reversal of 66121944 is 44912166.

It is a super-2 number, since 2×66121944² = 8744222956678272, which contains 22 as substring.

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, 196624 + ... + 196959.

It is an arithmetic number, because the mean of its divisors is an integer number (5903760).

Almost surely, 2^66121944 is an apocalyptic number.

It is an amenable number.

66121944 is an abundant number, since it is smaller than the sum of its proper divisors (122798376).

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

66121944 is a wasteful number, since it uses less digits than its factorization.

66121944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393599 (or 393595 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 66121944 is about 8131.5400755330. The cubic root of 66121944 is about 404.3727403330.

The spelling of 66121944 in words is "sixty-six million, one hundred twenty-one thousand, nine hundred forty-four".