61949548913 has 4 divisors (see below), whose sum is σ = 70799484480. Its totient is φ = 53099613348.

The previous prime is 61949548909. The next prime is 61949548919. The reversal of 61949548913 is 31984594916.

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 61949548913 - 2² = 61949548909 is a prime.

It is a super-2 number, since 2×61949548913² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61949548919) 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, 4424967773 + ... + 4424967786.

It is an arithmetic number, because the mean of its divisors is an integer number (17699871120).

Almost surely, 2^61949548913 is an apocalyptic number.

It is an amenable number.

61949548913 is a deficient number, since it is larger than the sum of its proper divisors (8849935567).

61949548913 is an equidigital number, since it uses as much as digits as its factorization.

61949548913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8849935566.

The product of its digits is 8398080, while the sum is 59.

The spelling of 61949548913 in words is "sixty-one billion, nine hundred forty-nine million, five hundred forty-eight thousand, nine hundred thirteen".