61431988633643 has 2 divisors, whose sum is σ = 61431988633644. Its totient is φ = 61431988633642.

The previous prime is 61431988633579. The next prime is 61431988633649. The reversal of 61431988633643 is 34633688913416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61431988633643 - 2⁶ = 61431988633579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61431988633643.

It is not a weakly prime, because it can be changed into another prime (61431988633649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30715994316821 + 30715994316822.

It is an arithmetic number, because the mean of its divisors is an integer number (30715994316822).

Almost surely, 2^{61431988633643} is an apocalyptic number.

61431988633643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61431988633643 is an equidigital number, since it uses as much as digits as its factorization.

61431988633643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161243136, while the sum is 65.

The spelling of 61431988633643 in words is "sixty-one trillion, four hundred thirty-one billion, nine hundred eighty-eight million, six hundred thirty-three thousand, six hundred forty-three".