66715942 has 16 divisors (see below), whose sum is σ = 101574000. Its totient is φ = 32861920.

The previous prime is 66715907. The next prime is 66715951. The reversal of 66715942 is 24951766.

It is a junction number, because it is equal to n+sod(n) for n = 66715895 and 66715904.

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, 38184 + ... + 39892.

It is an arithmetic number, because the mean of its divisors is an integer number (6348375).

Almost surely, 2^66715942 is an apocalyptic number.

66715942 is a deficient number, since it is larger than the sum of its proper divisors (34858058).

66715942 is a wasteful number, since it uses less digits than its factorization.

66715942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991.

The product of its digits is 90720, while the sum is 40.

The square root of 66715942 is about 8167.9827374940. The cubic root of 66715942 is about 405.5800092787.

The spelling of 66715942 in words is "sixty-six million, seven hundred fifteen thousand, nine hundred forty-two".