13261977397950 has 48 divisors (see below), whose sum is σ = 33045579399936. Its totient is φ = 3519766504800.

The previous prime is 13261977397939. The next prime is 13261977397957. The reversal of 13261977397950 is 5979377916231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13261977397957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209478262 + ... + 209541561.

It is an arithmetic number, because the mean of its divisors is an integer number (688449570832).

Almost surely, 2^{13261977397950} is an apocalyptic number.

13261977397950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13261977397950 is an abundant number, since it is smaller than the sum of its proper divisors (19783602001986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13261977397950 is a wasteful number, since it uses less digits than its factorization.

13261977397950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419020049 (or 419020044 counting only the distinct ones).

The product of its (nonzero) digits is 135025380, while the sum is 69.

The spelling of 13261977397950 in words is "thirteen trillion, two hundred sixty-one billion, nine hundred seventy-seven million, three hundred ninety-seven thousand, nine hundred fifty".