66872401 has 4 divisors (see below), whose sum is σ = 66893632. Its totient is φ = 66851172.

The previous prime is 66872387. The next prime is 66872411. The reversal of 66872401 is 10427866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66872401 - 2¹³ = 66864209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66872411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4845 + ... + 12538.

It is an arithmetic number, because the mean of its divisors is an integer number (16723408).

Almost surely, 2^66872401 is an apocalyptic number.

It is an amenable number.

66872401 is a deficient number, since it is larger than the sum of its proper divisors (21231).

66872401 is a wasteful number, since it uses less digits than its factorization.

66872401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21230.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66872401 is about 8177.5547078574. The cubic root of 66872401 is about 405.8968106315.

The spelling of 66872401 in words is "sixty-six million, eight hundred seventy-two thousand, four hundred one".