18937360834561 has 16 divisors (see below), whose sum is σ = 22730244969600. Its totient is φ = 15586453686528.

The previous prime is 18937360834519. The next prime is 18937360834583. The reversal of 18937360834561 is 16543806373981.

It is not a de Polignac number, because 18937360834561 - 2⁷ = 18937360834433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18937360834493 and 18937360834502.

It is not an unprimeable number, because it can be changed into a prime (18937360834261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2254980421 + ... + 2254988818.

It is an arithmetic number, because the mean of its divisors is an integer number (1420640310600).

Almost surely, 2^{18937360834561} is an apocalyptic number.

It is an amenable number.

18937360834561 is a deficient number, since it is larger than the sum of its proper divisors (3792884135039).

18937360834561 is a wasteful number, since it uses less digits than its factorization.

18937360834561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509969288.

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 18937360834561 in words is "eighteen trillion, nine hundred thirty-seven billion, three hundred sixty million, eight hundred thirty-four thousand, five hundred sixty-one".