1540220881868 has 48 divisors (see below), whose sum is σ = 2907009816480. Its totient is φ = 712559737344.

The previous prime is 1540220881819. The next prime is 1540220881873. The reversal of 1540220881868 is 8681880220451.

It is a super-2 number, since 2×1540220881868² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

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, 2648705 + ... + 3177432.

It is an arithmetic number, because the mean of its divisors is an integer number (60562704510).

Almost surely, 2^{1540220881868} is an apocalyptic number.

It is an amenable number.

1540220881868 is a deficient number, since it is larger than the sum of its proper divisors (1366788934612).

1540220881868 is a wasteful number, since it uses less digits than its factorization.

1540220881868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5826266 (or 5826264 counting only the distinct ones).

The product of its (nonzero) digits is 1966080, while the sum is 53.

The spelling of 1540220881868 in words is "one trillion, five hundred forty billion, two hundred twenty million, eight hundred eighty-one thousand, eight hundred sixty-eight".