61381271963 has 16 divisors (see below), whose sum is σ = 68532811776. Its totient is φ = 54492174240.

The previous prime is 61381271953. The next prime is 61381271983. The reversal of 61381271963 is 36917218316.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61381271963 - 2²² = 61377077659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61381271953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2977670 + ... + 2998212.

It is an arithmetic number, because the mean of its divisors is an integer number (4283300736).

Almost surely, 2^61381271963 is an apocalyptic number.

61381271963 is a deficient number, since it is larger than the sum of its proper divisors (7151539813).

61381271963 is a wasteful number, since it uses less digits than its factorization.

61381271963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26914.

The product of its digits is 326592, while the sum is 47.

The spelling of 61381271963 in words is "sixty-one billion, three hundred eighty-one million, two hundred seventy-one thousand, nine hundred sixty-three".