6642120694 has 32 divisors (see below), whose sum is σ = 11518518816. Its totient is φ = 2839019520.

The previous prime is 6642120673. The next prime is 6642120697. The reversal of 6642120694 is 4960212466.

It is a happy number.

It is a super-3 number, since 3×6642120694³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642120697) 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, 447862 + ... + 462454.

It is an arithmetic number, because the mean of its divisors is an integer number (359953713).

Almost surely, 2^6642120694 is an apocalyptic number.

6642120694 is a deficient number, since it is larger than the sum of its proper divisors (4876398122).

6642120694 is a wasteful number, since it uses less digits than its factorization.

6642120694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15840.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 6642120694 is about 81499.2067077956. The cubic root of 6642120694 is about 1879.7593525912.

The spelling of 6642120694 in words is "six billion, six hundred forty-two million, one hundred twenty thousand, six hundred ninety-four".