61658613149 has 4 divisors (see below), whose sum is σ = 70466986464. Its totient is φ = 52850239836.

The previous prime is 61658613143. The next prime is 61658613179. The reversal of 61658613149 is 94131685616.

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-61658613149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61658613097 and 61658613106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61658613143) 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, 4404186647 + ... + 4404186660.

It is an arithmetic number, because the mean of its divisors is an integer number (17616746616).

Almost surely, 2^61658613149 is an apocalyptic number.

It is an amenable number.

61658613149 is a deficient number, since it is larger than the sum of its proper divisors (8808373315).

61658613149 is an equidigital number, since it uses as much as digits as its factorization.

61658613149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808373314.

The product of its digits is 933120, while the sum is 50.

The spelling of 61658613149 in words is "sixty-one billion, six hundred fifty-eight million, six hundred thirteen thousand, one hundred forty-nine".