9921416651 has 2 divisors, whose sum is σ = 9921416652. Its totient is φ = 9921416650.

The previous prime is 9921416633. The next prime is 9921416663. The reversal of 9921416651 is 1566141299.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9921416651 is a prime.

It is not a weakly prime, because it can be changed into another prime (9921416621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960708325 + 4960708326.

It is an arithmetic number, because the mean of its divisors is an integer number (4960708326).

Almost surely, 2^9921416651 is an apocalyptic number.

9921416651 is a deficient number, since it is larger than the sum of its proper divisors (1).

9921416651 is an equidigital number, since it uses as much as digits as its factorization.

9921416651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 44.

The square root of 9921416651 is about 99606.3082891842. The cubic root of 9921416651 is about 2148.7764194136.

The spelling of 9921416651 in words is "nine billion, nine hundred twenty-one million, four hundred sixteen thousand, six hundred fifty-one".