6521100145 has 16 divisors (see below), whose sum is σ = 8947381248. Its totient is φ = 4469532480.

The previous prime is 6521100121. The next prime is 6521100169. The reversal of 6521100145 is 5410011256.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6521100121) and next prime (6521100169).

It is not a de Polignac number, because 6521100145 - 2²⁷ = 6386882417 is a prime.

It is a super-2 number, since 2×6521100145² = 85049494202238042050, which contains 22 as substring.

It is a Duffinian number.

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, 35035 + ... + 119455.

It is an arithmetic number, because the mean of its divisors is an integer number (559211328).

Almost surely, 2^6521100145 is an apocalyptic number.

It is an amenable number.

6521100145 is a deficient number, since it is larger than the sum of its proper divisors (2426281103).

6521100145 is a wasteful number, since it uses less digits than its factorization.

6521100145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86640.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 6521100145 is about 80753.3290025866. The cubic root of 6521100145 is about 1868.2727953520.

Subtracting from 6521100145 its reverse (5410011256), we obtain a square (1111088889 = 33333²).

The spelling of 6521100145 in words is "six billion, five hundred twenty-one million, one hundred thousand, one hundred forty-five".