2691397985 has 16 divisors (see below), whose sum is σ = 3286846080. Its totient is φ = 2115060480.

The previous prime is 2691397979. The next prime is 2691398009. The reversal of 2691397985 is 5897931962.

It is not a de Polignac number, because 2691397985 - 2⁶ = 2691397921 is a prime.

It is a super-2 number, since 2×2691397985² = 14487246227324120450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550100 + ... + 554970.

It is an arithmetic number, because the mean of its divisors is an integer number (205427880).

Almost surely, 2^2691397985 is an apocalyptic number.

It is an amenable number.

2691397985 is a deficient number, since it is larger than the sum of its proper divisors (595448095).

2691397985 is a wasteful number, since it uses less digits than its factorization.

2691397985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6808.

The product of its digits is 7348320, while the sum is 59.

The square root of 2691397985 is about 51878.6852666873. The cubic root of 2691397985 is about 1390.9962984705.

The spelling of 2691397985 in words is "two billion, six hundred ninety-one million, three hundred ninety-seven thousand, nine hundred eighty-five".