1661976368355 has 8 divisors (see below), whose sum is σ = 2659162189392. Its totient is φ = 886387396448.

The previous prime is 1661976368309. The next prime is 1661976368363. The reversal of 1661976368355 is 5538636791661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661976368355 - 2²⁰ = 1661975319779 is a prime.

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, 55399212264 + ... + 55399212293.

It is an arithmetic number, because the mean of its divisors is an integer number (332395273674).

Almost surely, 2^{1661976368355} is an apocalyptic number.

1661976368355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661976368355 is a deficient number, since it is larger than the sum of its proper divisors (997185821037).

1661976368355 is a wasteful number, since it uses less digits than its factorization.

1661976368355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110798424565.

The product of its digits is 146966400, while the sum is 66.

The spelling of 1661976368355 in words is "one trillion, six hundred sixty-one billion, nine hundred seventy-six million, three hundred sixty-eight thousand, three hundred fifty-five".