139961663 has 4 divisors (see below), whose sum is σ = 148194720. Its totient is φ = 131728608.

The previous prime is 139961641. The next prime is 139961719. The reversal of 139961663 is 366169931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366169931 = 631 ⋅580301.

It is a cyclic number.

It is not a de Polignac number, because 139961663 - 2⁸ = 139961407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139966663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4116503 + ... + 4116536.

It is an arithmetic number, because the mean of its divisors is an integer number (37048680).

Almost surely, 2^139961663 is an apocalyptic number.

139961663 is a deficient number, since it is larger than the sum of its proper divisors (8233057).

139961663 is an equidigital number, since it uses as much as digits as its factorization.

139961663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8233056.

The product of its digits is 157464, while the sum is 44.

The square root of 139961663 is about 11830.5394213451. The cubic root of 139961663 is about 519.2020095138.

The spelling of 139961663 in words is "one hundred thirty-nine million, nine hundred sixty-one thousand, six hundred sixty-three".