1698666612642 has 128 divisors (see below), whose sum is σ = 3924419051520. Its totient is φ = 544051287360.

The previous prime is 1698666612607. The next prime is 1698666612679. The reversal of 1698666612642 is 2462166668961.

It is a self number, because there is not a number n which added to its sum of digits gives 1698666612642.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 238338883 + ... + 238346009.

It is an arithmetic number, because the mean of its divisors is an integer number (30659523840).

Almost surely, 2^{1698666612642} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1698666612642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962209525760).

1698666612642 is an abundant number, since it is smaller than the sum of its proper divisors (2225752438878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1698666612642 is a wasteful number, since it uses less digits than its factorization.

1698666612642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8165 (or 8159 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 63.

The spelling of 1698666612642 in words is "one trillion, six hundred ninety-eight billion, six hundred sixty-six million, six hundred twelve thousand, six hundred forty-two".