61264145249 has 4 divisors (see below), whose sum is σ = 61363118640. Its totient is φ = 61165171860.

The previous prime is 61264145231. The next prime is 61264145251. The reversal of 61264145249 is 94254146216.

It is a happy number.

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-61264145249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61264145269) 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, 49485767 + ... + 49487004.

It is an arithmetic number, because the mean of its divisors is an integer number (15340779660).

Almost surely, 2^61264145249 is an apocalyptic number.

It is an amenable number.

61264145249 is a deficient number, since it is larger than the sum of its proper divisors (98973391).

61264145249 is an equidigital number, since it uses as much as digits as its factorization.

61264145249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98973390.

The product of its digits is 414720, while the sum is 44.

The spelling of 61264145249 in words is "sixty-one billion, two hundred sixty-four million, one hundred forty-five thousand, two hundred forty-nine".