155215515 has 48 divisors (see below), whose sum is σ = 307369728. Its totient is φ = 65490048.

The previous prime is 155215493. The next prime is 155215531. The reversal of 155215515 is 515512551.

It is not a de Polignac number, because 155215515 - 2⁶ = 155215451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13372 + ... + 22118.

It is an arithmetic number, because the mean of its divisors is an integer number (6403536).

Almost surely, 2^155215515 is an apocalyptic number.

155215515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155215515 is a deficient number, since it is larger than the sum of its proper divisors (152154213).

155215515 is a wasteful number, since it uses less digits than its factorization.

155215515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8788 (or 8775 counting only the distinct ones).

The product of its digits is 6250, while the sum is 30.

The square root of 155215515 is about 12458.5518821410. The cubic root of 155215515 is about 537.4173833720.

The spelling of 155215515 in words is "one hundred fifty-five million, two hundred fifteen thousand, five hundred fifteen".