2391211906651 has 16 divisors (see below), whose sum is σ = 2433928790016. Its totient is φ = 2348610660000.

The previous prime is 2391211906627. The next prime is 2391211906661. The reversal of 2391211906651 is 1566091121932.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2391211906651 - 2²³ = 2391203518043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391211906661) 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 15 ways as a sum of consecutive naturals, for example, 163875366 + ... + 163889956.

It is an arithmetic number, because the mean of its divisors is an integer number (152120549376).

Almost surely, 2^{2391211906651} is an apocalyptic number.

2391211906651 is a deficient number, since it is larger than the sum of its proper divisors (42716883365).

2391211906651 is a wasteful number, since it uses less digits than its factorization.

2391211906651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18354.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 2391211906651 in words is "two trillion, three hundred ninety-one billion, two hundred eleven million, nine hundred six thousand, six hundred fifty-one".