66771403 has 4 divisors (see below), whose sum is σ = 67432608. Its totient is φ = 66110200.

The previous prime is 66771401. The next prime is 66771409. The reversal of 66771403 is 30417766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66771403 - 2¹ = 66771401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66771401) 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, 330451 + ... + 330652.

It is an arithmetic number, because the mean of its divisors is an integer number (16858152).

Almost surely, 2^66771403 is an apocalyptic number.

66771403 is a deficient number, since it is larger than the sum of its proper divisors (661205).

66771403 is a wasteful number, since it uses less digits than its factorization.

66771403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661204.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 66771403 is about 8171.3770565309. The cubic root of 66771403 is about 405.6923644472.

The spelling of 66771403 in words is "sixty-six million, seven hundred seventy-one thousand, four hundred three".