999651291007841 has 2 divisors, whose sum is σ = 999651291007842. Its totient is φ = 999651291007840.

The previous prime is 999651291007687. The next prime is 999651291007871. The reversal of 999651291007841 is 148700192156999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728801293542400 + 270849997465441 = 26996320^2 + 16457521^2 .

It is a cyclic number.

It is not a de Polignac number, because 999651291007841 - 2⁴² = 995253244496737 is a prime.

It is a super-2 number, since 2×999651291007841² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999651291007871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499825645503920 + 499825645503921.

It is an arithmetic number, because the mean of its divisors is an integer number (499825645503921).

Almost surely, 2^{999651291007841} is an apocalyptic number.

It is an amenable number.

999651291007841 is a deficient number, since it is larger than the sum of its proper divisors (1).

999651291007841 is an equidigital number, since it uses as much as digits as its factorization.

999651291007841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88179840, while the sum is 71.

The spelling of 999651291007841 in words is "nine hundred ninety-nine trillion, six hundred fifty-one billion, two hundred ninety-one million, seven thousand, eight hundred forty-one".