66731402 has 4 divisors (see below), whose sum is σ = 100097106. Its totient is φ = 33365700.

The previous prime is 66731393. The next prime is 66731411. The reversal of 66731402 is 20413766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20413766 = 2 ⋅10206883.

It is an interprime number because it is at equal distance from previous prime (66731393) and next prime (66731411).

It can be written as a sum of positive squares in only one way, i.e., 51136801 + 15594601 = 7151^2 + 3949^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16682849 + ... + 16682852.

Almost surely, 2^66731402 is an apocalyptic number.

66731402 is a deficient number, since it is larger than the sum of its proper divisors (33365704).

66731402 is a wasteful number, since it uses less digits than its factorization.

66731402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33365703.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66731402 is about 8168.9290607766. The cubic root of 66731402 is about 405.6113350382.

The spelling of 66731402 in words is "sixty-six million, seven hundred thirty-one thousand, four hundred two".