1661392346838 has 32 divisors (see below), whose sum is σ = 3874967577600. Its totient is φ = 474683527080.

The previous prime is 1661392346827. The next prime is 1661392346879. The reversal of 1661392346838 is 8386432931661.

It is a congruent number.

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, 403640398 + ... + 403644513.

It is an arithmetic number, because the mean of its divisors is an integer number (121092736800).

Almost surely, 2^{1661392346838} is an apocalyptic number.

1661392346838 is an abundant number, since it is smaller than the sum of its proper divisors (2213575230762).

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

1661392346838 is an equidigital number, since it uses as much as digits as its factorization.

1661392346838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807284937 (or 807284923 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 60.

The spelling of 1661392346838 in words is "one trillion, six hundred sixty-one billion, three hundred ninety-two million, three hundred forty-six thousand, eight hundred thirty-eight".