61421823863 has 16 divisors (see below), whose sum is σ = 64777814976. Its totient is φ = 58123422720.

The previous prime is 61421823857. The next prime is 61421823893. The reversal of 61421823863 is 36832812416.

It is a cyclic number.

It is not a de Polignac number, because 61421823863 - 2⁴ = 61421823847 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 (61421823823) 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, 11002733 + ... + 11008313.

It is an arithmetic number, because the mean of its divisors is an integer number (4048613436).

Almost surely, 2^61421823863 is an apocalyptic number.

61421823863 is a deficient number, since it is larger than the sum of its proper divisors (3355991113).

61421823863 is a wasteful number, since it uses less digits than its factorization.

61421823863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634.

The product of its digits is 331776, while the sum is 44.

The spelling of 61421823863 in words is "sixty-one billion, four hundred twenty-one million, eight hundred twenty-three thousand, eight hundred sixty-three".