2171690675953 has 4 divisors (see below), whose sum is σ = 2181011237028. Its totient is φ = 2162370114880.

The previous prime is 2171690675939. The next prime is 2171690675993. The reversal of 2171690675953 is 3595760961712.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1240566033249 + 931124642704 = 1113807^2 + 964948^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171690675953 - 2¹³ = 2171690667761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2171690675891 and 2171690675900.

It is not an unprimeable number, because it can be changed into a prime (2171690675993) 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, 4660280188 + ... + 4660280653.

It is an arithmetic number, because the mean of its divisors is an integer number (545252809257).

Almost surely, 2^{2171690675953} is an apocalyptic number.

It is an amenable number.

2171690675953 is a deficient number, since it is larger than the sum of its proper divisors (9320561075).

2171690675953 is an equidigital number, since it uses as much as digits as its factorization.

2171690675953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9320561074.

The product of its (nonzero) digits is 21432600, while the sum is 61.

The spelling of 2171690675953 in words is "two trillion, one hundred seventy-one billion, six hundred ninety million, six hundred seventy-five thousand, nine hundred fifty-three".