154181331621 has 24 divisors (see below), whose sum is σ = 226000082880. Its totient is φ = 101269392000.

The previous prime is 154181331599. The next prime is 154181331641. The reversal of 154181331621 is 126133181451.

154181331621 is a `hidden beast` number, since 1 + 5 + 4 + 18 + 13 + 3 + 1 + 621 = 666.

It is not a de Polignac number, because 154181331621 - 2¹⁴ = 154181315237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154181331641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 844045 + ... + 1010333.

It is an arithmetic number, because the mean of its divisors is an integer number (9416670120).

Almost surely, 2^154181331621 is an apocalyptic number.

It is an amenable number.

154181331621 is a deficient number, since it is larger than the sum of its proper divisors (71818751259).

154181331621 is a wasteful number, since it uses less digits than its factorization.

154181331621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167817 (or 167814 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 154181331621 in words is "one hundred fifty-four billion, one hundred eighty-one million, three hundred thirty-one thousand, six hundred twenty-one".