61438508463 has 4 divisors (see below), whose sum is σ = 81918011288. Its totient is φ = 40959005640.

The previous prime is 61438508459. The next prime is 61438508479. The reversal of 61438508463 is 36480583416.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61438508463 - 2² = 61438508459 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 (61438108463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10239751408 + ... + 10239751413.

It is an arithmetic number, because the mean of its divisors is an integer number (20479502822).

Almost surely, 2^61438508463 is an apocalyptic number.

61438508463 is a deficient number, since it is larger than the sum of its proper divisors (20479502825).

61438508463 is a wasteful number, since it uses less digits than its factorization.

61438508463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20479502824.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 61438508463 in words is "sixty-one billion, four hundred thirty-eight million, five hundred eight thousand, four hundred sixty-three".