66201581403 has 6 divisors (see below), whose sum is σ = 95624506484. Its totient is φ = 44134387596.

The previous prime is 66201581401. The next prime is 66201581431. The reversal of 66201581403 is 30418510266.

It is a happy number.

66201581403 is a `hidden beast` number, since 6 + 620 + 15 + 8 + 14 + 0 + 3 = 666.

It is not a de Polignac number, because 66201581403 - 2¹ = 66201581401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66201581401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3677865625 + ... + 3677865642.

Almost surely, 2^66201581403 is an apocalyptic number.

66201581403 is a deficient number, since it is larger than the sum of its proper divisors (29422925081).

66201581403 is a wasteful number, since it uses less digits than its factorization.

66201581403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7355731273 (or 7355731270 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 66201581403 in words is "sixty-six billion, two hundred one million, five hundred eighty-one thousand, four hundred three".