154996221815 has 24 divisors (see below), whose sum is σ = 199229929200. Its totient is φ = 115717434624.

The previous prime is 154996221811. The next prime is 154996221827. The reversal of 154996221815 is 518122699451.

It is not a de Polignac number, because 154996221815 - 2² = 154996221811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154996221811) 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, 519890 + ... + 761759.

It is an arithmetic number, because the mean of its divisors is an integer number (8301247050).

Almost surely, 2^154996221815 is an apocalyptic number.

154996221815 is a deficient number, since it is larger than the sum of its proper divisors (44233707385).

154996221815 is a wasteful number, since it uses less digits than its factorization.

154996221815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281759 (or 1281740 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 53.

The spelling of 154996221815 in words is "one hundred fifty-four billion, nine hundred ninety-six million, two hundred twenty-one thousand, eight hundred fifteen".