642615016 has 8 divisors (see below), whose sum is σ = 1204903170. Its totient is φ = 321307504.

The previous prime is 642615013. The next prime is 642615019. The reversal of 642615016 is 610516246.

It is an interprime number because it is at equal distance from previous prime (642615013) and next prime (642615019).

It can be written as a sum of positive squares in only one way, i.e., 461820100 + 180794916 = 21490^2 + 13446^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (642615013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40163431 + ... + 40163446.

Almost surely, 2^642615016 is an apocalyptic number.

It is an amenable number.

642615016 is a deficient number, since it is larger than the sum of its proper divisors (562288154).

642615016 is a wasteful number, since it uses less digits than its factorization.

642615016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80326883 (or 80326879 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 642615016 is about 25349.8523861580. The cubic root of 642615016 is about 862.9460062795.

The spelling of 642615016 in words is "six hundred forty-two million, six hundred fifteen thousand, sixteen".