61018199641 has 4 divisors (see below), whose sum is σ = 69735085312. Its totient is φ = 52301313972.

The previous prime is 61018199639. The next prime is 61018199701. The reversal of 61018199641 is 14699181016.

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 not a de Polignac number, because 61018199641 - 2¹ = 61018199639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61018199591 and 61018199600.

It is not an unprimeable number, because it can be changed into a prime (61018199741) 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, 4358442825 + ... + 4358442838.

It is an arithmetic number, because the mean of its divisors is an integer number (17433771328).

Almost surely, 2^61018199641 is an apocalyptic number.

It is an amenable number.

61018199641 is a deficient number, since it is larger than the sum of its proper divisors (8716885671).

61018199641 is an equidigital number, since it uses as much as digits as its factorization.

61018199641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8716885670.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 61018199641 in words is "sixty-one billion, eighteen million, one hundred ninety-nine thousand, six hundred forty-one".