642263988515 has 16 divisors (see below), whose sum is σ = 787346621568. Its totient is φ = 502731067776.

The previous prime is 642263988511. The next prime is 642263988529. The reversal of 642263988515 is 515889362246.

It is a happy number.

642263988515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 642263988515 - 2² = 642263988511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642263988511) 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, 401669 + ... + 1202441.

It is an arithmetic number, because the mean of its divisors is an integer number (49209163848).

Almost surely, 2^642263988515 is an apocalyptic number.

642263988515 is a deficient number, since it is larger than the sum of its proper divisors (145082633053).

642263988515 is a wasteful number, since it uses less digits than its factorization.

642263988515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804238.

The product of its digits is 24883200, while the sum is 59.

The spelling of 642263988515 in words is "six hundred forty-two billion, two hundred sixty-three million, nine hundred eighty-eight thousand, five hundred fifteen".