61408804863 has 64 divisors (see below), whose sum is σ = 102284024832. Its totient is φ = 31972147200.

The previous prime is 61408804823. The next prime is 61408804939. The reversal of 61408804863 is 36840880416.

It is a Cunningham number, because it is equal to 247808²-1.

It is not a de Polignac number, because 61408804863 - 2¹⁴ = 61408788479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61408804823) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1716963 + ... + 1752363.

It is an arithmetic number, because the mean of its divisors is an integer number (1598187888).

Almost surely, 2^61408804863 is an apocalyptic number.

61408804863 is a deficient number, since it is larger than the sum of its proper divisors (40875219969).

61408804863 is a wasteful number, since it uses less digits than its factorization.

61408804863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35584.

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 61408804863 in words is "sixty-one billion, four hundred eight million, eight hundred four thousand, eight hundred sixty-three".