61799721401 has 8 divisors (see below), whose sum is σ = 67469475744. Its totient is φ = 56138566720.

The previous prime is 61799721397. The next prime is 61799721413. The reversal of 61799721401 is 10412799716.

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 61799721401 - 2² = 61799721397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61799721481) 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, 2134880 + ... + 2163633.

It is an arithmetic number, because the mean of its divisors is an integer number (8433684468).

Almost surely, 2^61799721401 is an apocalyptic number.

It is an amenable number.

61799721401 is a deficient number, since it is larger than the sum of its proper divisors (5669754343).

61799721401 is a wasteful number, since it uses less digits than its factorization.

61799721401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299831.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 61799721401 in words is "sixty-one billion, seven hundred ninety-nine million, seven hundred twenty-one thousand, four hundred one".