154961840985 has 64 divisors (see below), whose sum is σ = 287693586432. Its totient is φ = 69759069696.

The previous prime is 154961840959. The next prime is 154961840993. The reversal of 154961840985 is 589048169451.

It is not a de Polignac number, because 154961840985 - 2¹⁴ = 154961824601 is a prime.

It is a super-2 number, since 2×154961840985² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4943632 + ... + 4974878.

It is an arithmetic number, because the mean of its divisors is an integer number (4495212288).

Almost surely, 2^154961840985 is an apocalyptic number.

154961840985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

154961840985 is a deficient number, since it is larger than the sum of its proper divisors (132731745447).

154961840985 is a wasteful number, since it uses less digits than its factorization.

154961840985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31982.

The product of its (nonzero) digits is 12441600, while the sum is 60.

The spelling of 154961840985 in words is "one hundred fifty-four billion, nine hundred sixty-one million, eight hundred forty thousand, nine hundred eighty-five".