61971377843 has 8 divisors (see below), whose sum is σ = 62789462736. Its totient is φ = 61158520800.

The previous prime is 61971377801. The next prime is 61971377851. The reversal of 61971377843 is 34877317916.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61971377843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61971377863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1283096 + ... + 1330517.

It is an arithmetic number, because the mean of its divisors is an integer number (7848682842).

Almost surely, 2^61971377843 is an apocalyptic number.

61971377843 is a deficient number, since it is larger than the sum of its proper divisors (818084893).

61971377843 is a wasteful number, since it uses less digits than its factorization.

61971377843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613925.

The product of its digits is 5334336, while the sum is 56.

The spelling of 61971377843 in words is "sixty-one billion, nine hundred seventy-one million, three hundred seventy-seven thousand, eight hundred forty-three".