1561897651902 has 16 divisors (see below), whose sum is σ = 3570051775872. Its totient is φ = 446256471960.

The previous prime is 1561897651889. The next prime is 1561897651933. The reversal of 1561897651902 is 2091567981651.

It is a happy number.

It is a congruent number.

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, 18594019624 + ... + 18594019707.

It is an arithmetic number, because the mean of its divisors is an integer number (223128235992).

Almost surely, 2^{1561897651902} is an apocalyptic number.

1561897651902 is an abundant number, since it is smaller than the sum of its proper divisors (2008154123970).

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

1561897651902 is a wasteful number, since it uses less digits than its factorization.

1561897651902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37188039343.

The product of its (nonzero) digits is 8164800, while the sum is 60.

The spelling of 1561897651902 in words is "one trillion, five hundred sixty-one billion, eight hundred ninety-seven million, six hundred fifty-one thousand, nine hundred two".