18400937909761 has 16 divisors (see below), whose sum is σ = 20119618874880. Its totient is φ = 16689922708480.

The previous prime is 18400937909759. The next prime is 18400937909771. The reversal of 18400937909761 is 16790973900481.

It is a cyclic number.

It is not a de Polignac number, because 18400937909761 - 2¹ = 18400937909759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18400937909693 and 18400937909702.

It is not an unprimeable number, because it can be changed into a prime (18400937909741) 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, 17040240 + ... + 18087886.

It is an arithmetic number, because the mean of its divisors is an integer number (1257476179680).

Almost surely, 2^{18400937909761} is an apocalyptic number.

18400937909761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18400937909761 is a deficient number, since it is larger than the sum of its proper divisors (1718680965119).

18400937909761 is a wasteful number, since it uses less digits than its factorization.

18400937909761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051304.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 18400937909761 in words is "eighteen trillion, four hundred billion, nine hundred thirty-seven million, nine hundred nine thousand, seven hundred sixty-one".