161100151515 has 24 divisors (see below), whose sum is σ = 279321494400. Its totient is φ = 85895086464.

The previous prime is 161100151507. The next prime is 161100151559. The reversal of 161100151515 is 515151001161.

It is not a de Polignac number, because 161100151515 - 2³ = 161100151507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363787 + ... + 674196.

It is an arithmetic number, because the mean of its divisors is an integer number (11638395600).

Almost surely, 2^161100151515 is an apocalyptic number.

161100151515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161100151515 is a deficient number, since it is larger than the sum of its proper divisors (118221342885).

161100151515 is a wasteful number, since it uses less digits than its factorization.

161100151515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041443 (or 1041440 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 27.

Adding to 161100151515 its reverse (515151001161), we get a palindrome (676251152676).

The spelling of 161100151515 in words is "one hundred sixty-one billion, one hundred million, one hundred fifty-one thousand, five hundred fifteen".