61725978311 has 8 divisors (see below), whose sum is σ = 62297835600. Its totient is φ = 61154222400.

The previous prime is 61725978257. The next prime is 61725978323. The reversal of 61725978311 is 11387952716.

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 not a de Polignac number, because 61725978311 - 2¹⁸ = 61725716167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61725978311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61725978911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1806536 + ... + 1840386.

It is an arithmetic number, because the mean of its divisors is an integer number (7787229450).

Almost surely, 2^61725978311 is an apocalyptic number.

61725978311 is a deficient number, since it is larger than the sum of its proper divisors (571857289).

61725978311 is a wasteful number, since it uses less digits than its factorization.

61725978311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50689.

The product of its digits is 635040, while the sum is 50.

The spelling of 61725978311 in words is "sixty-one billion, seven hundred twenty-five million, nine hundred seventy-eight thousand, three hundred eleven".