6845951891529 has 9 divisors (see below), whose sum is σ = 9888608514733. Its totient is φ = 4563962694732.

The previous prime is 6845951891507. The next prime is 6845951891533. The reversal of 6845951891529 is 9251981595486.

The square root of 6845951891529 is 2616477.

It is a perfect power (a square), and thus also a powerful number.

6845951891529 is a `hidden beast` number, since 6 + 8 + 4 + 5 + 9 + 5 + 1 + 8 + 91 + 529 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 6845951891529 - 2¹⁵ = 6845951858761 is a prime.

It is a super-2 number, since 2×6845951891529² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6845951891029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7413352 + ... + 8285510.

Almost surely, 2^{6845951891529} is an apocalyptic number.

6845951891529 is the 2616477-th square number.

6845951891529 is the 1308239-th centered octagonal number.

It is an amenable number.

6845951891529 is a deficient number, since it is larger than the sum of its proper divisors (3042656623204).

6845951891529 is an frugal number, since it uses more digits than its factorization.

6845951891529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744324 (or 872162 counting only the distinct ones).

The product of its digits is 279936000, while the sum is 72.

The spelling of 6845951891529 in words is "six trillion, eight hundred forty-five billion, nine hundred fifty-one million, eight hundred ninety-one thousand, five hundred twenty-nine".