1645995461 has 4 divisors (see below), whose sum is σ = 1795631424. Its totient is φ = 1496359500.

The previous prime is 1645995457. The next prime is 1645995469.

1645995461 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1645995461 - 2² = 1645995457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645995469) 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, 74817965 + ... + 74817986.

It is an arithmetic number, because the mean of its divisors is an integer number (448907856).

Almost surely, 2^1645995461 is an apocalyptic number.

1645995461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1645995461 is a deficient number, since it is larger than the sum of its proper divisors (149635963).

1645995461 is a wasteful number, since it uses less digits than its factorization.

1645995461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149635962.

The product of its digits is 1166400, while the sum is 50.

The square root of 1645995461 is about 40570.8696110892. The cubic root of 1645995461 is about 1180.7090110833.

The spelling of 1645995461 in words is "one billion, six hundred forty-five million, nine hundred ninety-five thousand, four hundred sixty-one".