642015678619 has 8 divisors (see below), whose sum is σ = 733919459840. Its totient is φ = 550158711336.

The previous prime is 642015678607. The next prime is 642015678641. The reversal of 642015678619 is 916876510246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642015678619 - 2¹⁹ = 642015154331 is a prime.

It is a super-2 number, since 2×642015678619² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642015678619.

It is not an unprimeable number, because it can be changed into a prime (642015678419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11674089 + ... + 11728954.

It is an arithmetic number, because the mean of its divisors is an integer number (91739932480).

Almost surely, 2^642015678619 is an apocalyptic number.

642015678619 is a deficient number, since it is larger than the sum of its proper divisors (91903781221).

642015678619 is a wasteful number, since it uses less digits than its factorization.

642015678619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23406969.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 642015678619 in words is "six hundred forty-two billion, fifteen million, six hundred seventy-eight thousand, six hundred nineteen".