66372405 has 32 divisors (see below), whose sum is σ = 116242560. Its totient is φ = 32071680.

The previous prime is 66372401. The next prime is 66372409. The reversal of 66372405 is 50427366.

It is an interprime number because it is at equal distance from previous prime (66372401) and next prime (66372409).

It is not a de Polignac number, because 66372405 - 2² = 66372401 is a prime.

It is a super-2 number, since 2×66372405² = 8810592290968050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66372401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70981 + ... + 71909.

It is an arithmetic number, because the mean of its divisors is an integer number (3632580).

Almost surely, 2^66372405 is an apocalyptic number.

It is an amenable number.

66372405 is a deficient number, since it is larger than the sum of its proper divisors (49870155).

66372405 is a wasteful number, since it uses less digits than its factorization.

66372405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 66372405 is about 8146.9261074346. The cubic root of 66372405 is about 404.8826668183.

The spelling of 66372405 in words is "sixty-six million, three hundred seventy-two thousand, four hundred five".