1264190652891 has 20 divisors (see below), whose sum is σ = 1939522400992. Its totient is φ = 820015556688.

The previous prime is 1264190652889. The next prime is 1264190652917. The reversal of 1264190652891 is 1982560914621.

1264190652891 is a `hidden beast` number, since 1 + 26 + 4 + 1 + 9 + 0 + 6 + 528 + 91 = 666.

It is not a de Polignac number, because 1264190652891 - 2¹ = 1264190652889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264190652841) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 210906355 + ... + 210912348.

Almost surely, 2^{1264190652891} is an apocalyptic number.

1264190652891 is a deficient number, since it is larger than the sum of its proper divisors (675331748101).

1264190652891 is an equidigital number, since it uses as much as digits as its factorization.

1264190652891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421818752 (or 421818743 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 1264190652891 in words is "one trillion, two hundred sixty-four billion, one hundred ninety million, six hundred fifty-two thousand, eight hundred ninety-one".