66530513401 has 16 divisors (see below), whose sum is σ = 72992311488. Its totient is φ = 60138496000.

The previous prime is 66530513381. The next prime is 66530513419. The reversal of 66530513401 is 10431503566.

It is not a de Polignac number, because 66530513401 - 2²³ = 66522124793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66530513201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1570701 + ... + 1612501.

It is an arithmetic number, because the mean of its divisors is an integer number (4562019468).

Almost surely, 2^66530513401 is an apocalyptic number.

It is an amenable number.

66530513401 is a deficient number, since it is larger than the sum of its proper divisors (6461798087).

66530513401 is a wasteful number, since it uses less digits than its factorization.

66530513401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42632.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 66530513401 in words is "sixty-six billion, five hundred thirty million, five hundred thirteen thousand, four hundred one".