60921798991 has 2 divisors, whose sum is σ = 60921798992. Its totient is φ = 60921798990.

The previous prime is 60921798967. The next prime is 60921799049. The reversal of 60921798991 is 19989712906.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 60921798991 - 2²¹ = 60919701839 is a prime.

It is a super-2 number, since 2×60921798991² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60921798191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30460899495 + 30460899496.

It is an arithmetic number, because the mean of its divisors is an integer number (30460899496).

Almost surely, 2^60921798991 is an apocalyptic number.

60921798991 is a deficient number, since it is larger than the sum of its proper divisors (1).

60921798991 is an equidigital number, since it uses as much as digits as its factorization.

60921798991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 61.

The spelling of 60921798991 in words is "sixty billion, nine hundred twenty-one million, seven hundred ninety-eight thousand, nine hundred ninety-one".