1026646860551 has 4 divisors (see below), whose sum is σ = 1105619695992. Its totient is φ = 947674025112.

The previous prime is 1026646860521. The next prime is 1026646860559. The reversal of 1026646860551 is 1550686466201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1026646860551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1026646860551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026646860559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39486417701 + ... + 39486417726.

It is an arithmetic number, because the mean of its divisors is an integer number (276404923998).

Almost surely, 2^{1026646860551} is an apocalyptic number.

1026646860551 is a deficient number, since it is larger than the sum of its proper divisors (78972835441).

1026646860551 is an equidigital number, since it uses as much as digits as its factorization.

1026646860551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78972835440.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 1026646860551 in words is "one trillion, twenty-six billion, six hundred forty-six million, eight hundred sixty thousand, five hundred fifty-one".