61491501433 has 4 divisors (see below), whose sum is σ = 61514734720. Its totient is φ = 61468268148.

The previous prime is 61491501419. The next prime is 61491501469. The reversal of 61491501433 is 33410519416.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61491501433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61491501392 and 61491501401.

It is not an unprimeable number, because it can be changed into a prime (61491501413) 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, 11612673 + ... + 11617966.

It is an arithmetic number, because the mean of its divisors is an integer number (15378683680).

Almost surely, 2^61491501433 is an apocalyptic number.

It is an amenable number.

61491501433 is a deficient number, since it is larger than the sum of its proper divisors (23233287).

61491501433 is a wasteful number, since it uses less digits than its factorization.

61491501433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23233286.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 61491501433 in words is "sixty-one billion, four hundred ninety-one million, five hundred one thousand, four hundred thirty-three".