68455161840 has 80 divisors (see below), whose sum is σ = 228534935328. Its totient is φ = 16850500608.

The previous prime is 68455161799. The next prime is 68455161851. The reversal of 68455161840 is 4816155486.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×68455161840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 68455161840.

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, 10967259 + ... + 10973498.

Almost surely, 2^68455161840 is an apocalyptic number.

68455161840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68455161840 is an abundant number, since it is smaller than the sum of its proper divisors (160079773488).

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

68455161840 is a wasteful number, since it uses less digits than its factorization.

68455161840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21940786 (or 21940780 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 68455161840 in words is "sixty-eight billion, four hundred fifty-five million, one hundred sixty-one thousand, eight hundred forty".