642923031819 has 16 divisors (see below), whose sum is σ = 862397586432. Its totient is φ = 426033133728.

The previous prime is 642923031763. The next prime is 642923031823. The reversal of 642923031819 is 918130329246.

642923031819 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642923031819 - 2⁸ = 642923031563 is a prime.

It is a super-2 number, since 2×642923031819² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642923031119) 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, 1991832 + ... + 2291994.

It is an arithmetic number, because the mean of its divisors is an integer number (53899849152).

Almost surely, 2^642923031819 is an apocalyptic number.

642923031819 is a deficient number, since it is larger than the sum of its proper divisors (219474554613).

642923031819 is a wasteful number, since it uses less digits than its factorization.

642923031819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304466.

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 642923031819 in words is "six hundred forty-two billion, nine hundred twenty-three million, thirty-one thousand, eight hundred nineteen".