1642990402690 has 32 divisors (see below), whose sum is σ = 3639855663360. Its totient is φ = 519979379904.

The previous prime is 1642990402649. The next prime is 1642990402759. The reversal of 1642990402690 is 962040992461.

It is a happy number.

It is a super-2 number, since 2×1642990402690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 902741070 + ... + 902742889.

It is an arithmetic number, because the mean of its divisors is an integer number (113745489480).

Almost surely, 2^{1642990402690} is an apocalyptic number.

1642990402690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1642990402690 is an abundant number, since it is smaller than the sum of its proper divisors (1996865260670).

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

1642990402690 is a wasteful number, since it uses less digits than its factorization.

1642990402690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805483986.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 1642990402690 in words is "one trillion, six hundred forty-two billion, nine hundred ninety million, four hundred two thousand, six hundred ninety".