100506978415 has 4 divisors (see below), whose sum is σ = 120608374104. Its totient is φ = 80405582728.

The previous prime is 100506978401. The next prime is 100506978443. The reversal of 100506978415 is 514879605001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100506978415 is a prime.

It is a super-2 number, since 2×100506978415² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10050697837 + ... + 10050697846.

It is an arithmetic number, because the mean of its divisors is an integer number (30152093526).

Almost surely, 2^100506978415 is an apocalyptic number.

100506978415 is a deficient number, since it is larger than the sum of its proper divisors (20101395689).

100506978415 is an equidigital number, since it uses as much as digits as its factorization.

100506978415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20101395688.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 100506978415 in words is "one hundred billion, five hundred six million, nine hundred seventy-eight thousand, four hundred fifteen".