642699611 has 4 divisors (see below), whose sum is σ = 642802224. Its totient is φ = 642597000.

The previous prime is 642699587. The next prime is 642699613. The reversal of 642699611 is 116996246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116996246 = 2 ⋅58498123.

It is a cyclic number.

It is not a de Polignac number, because 642699611 - 2²⁶ = 575590747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642699613) 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, 41255 + ... + 54656.

It is an arithmetic number, because the mean of its divisors is an integer number (160700556).

Almost surely, 2^642699611 is an apocalyptic number.

642699611 is a deficient number, since it is larger than the sum of its proper divisors (102613).

642699611 is an equidigital number, since it uses as much as digits as its factorization.

642699611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102612.

The product of its digits is 139968, while the sum is 44.

The square root of 642699611 is about 25351.5208813988. The cubic root of 642699611 is about 862.9838712077.

The spelling of 642699611 in words is "six hundred forty-two million, six hundred ninety-nine thousand, six hundred eleven".