13920861505 has 8 divisors (see below), whose sum is σ = 16705837224. Its totient is φ = 11136153600.

The previous prime is 13920861491. The next prime is 13920861529. The reversal of 13920861505 is 50516802931.

It can be written as a sum of positive squares in 4 ways, for example, as 4144398129 + 9776463376 = 64377^2 + 98876^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13920861505 - 2⁵ = 13920861473 is a prime.

It is a super-3 number, since 3×13920861505³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74625 + ... + 182785.

It is an arithmetic number, because the mean of its divisors is an integer number (2088229653).

Almost surely, 2^13920861505 is an apocalyptic number.

It is an amenable number.

13920861505 is a deficient number, since it is larger than the sum of its proper divisors (2784975719).

13920861505 is a wasteful number, since it uses less digits than its factorization.

13920861505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133907.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 13920861505 in words is "thirteen billion, nine hundred twenty million, eight hundred sixty-one thousand, five hundred five".