2621253779 has 8 divisors (see below), whose sum is σ = 2742320448. Its totient is φ = 2502907840.

The previous prime is 2621253773. The next prime is 2621253781. The reversal of 2621253779 is 9773521262.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2621253779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621253773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678212 + ... + 682065.

It is an arithmetic number, because the mean of its divisors is an integer number (342790056).

Almost surely, 2^2621253779 is an apocalyptic number.

2621253779 is a deficient number, since it is larger than the sum of its proper divisors (121066669).

2621253779 is a wasteful number, since it uses less digits than its factorization.

2621253779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360365.

The product of its digits is 317520, while the sum is 44.

The square root of 2621253779 is about 51198.1814032491. The cubic root of 2621253779 is about 1378.8055510277.

The spelling of 2621253779 in words is "two billion, six hundred twenty-one million, two hundred fifty-three thousand, seven hundred seventy-nine".