117418487021781 has 16 divisors (see below), whose sum is σ = 171744663605760. Its totient is φ = 70765162311920.

The previous prime is 117418487021729. The next prime is 117418487021813. The reversal of 117418487021781 is 187120784814711.

It is a cyclic number.

It is not a de Polignac number, because 117418487021781 - 2⁷ = 117418487021653 is a prime.

It is a super-2 number, since 2×117418487021781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117418487091781) 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, 9938921385 + ... + 9938933198.

It is an arithmetic number, because the mean of its divisors is an integer number (10734041475360).

Almost surely, 2^{117418487021781} is an apocalyptic number.

117418487021781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

117418487021781 is a deficient number, since it is larger than the sum of its proper divisors (54326176583979).

117418487021781 is a wasteful number, since it uses less digits than its factorization.

117418487021781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19877854776.

The product of its (nonzero) digits is 5619712, while the sum is 60.

The spelling of 117418487021781 in words is "one hundred seventeen trillion, four hundred eighteen billion, four hundred eighty-seven million, twenty-one thousand, seven hundred eighty-one".