18219639802 has 16 divisors (see below), whose sum is σ = 33636258432. Its totient is φ = 7207769520.

The previous prime is 18219639793. The next prime is 18219639829. The reversal of 18219639802 is 20893691281.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50053774 + ... + 50054137.

It is an arithmetic number, because the mean of its divisors is an integer number (2102266152).

Almost surely, 2^18219639802 is an apocalyptic number.

18219639802 is a deficient number, since it is larger than the sum of its proper divisors (15416618630).

18219639802 is a wasteful number, since it uses less digits than its factorization.

18219639802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100107933.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 18219639802 in words is "eighteen billion, two hundred nineteen million, six hundred thirty-nine thousand, eight hundred two".