1621775463 has 48 divisors (see below), whose sum is σ = 2761156608. Its totient is φ = 828590400.

The previous prime is 1621775443. The next prime is 1621775501. The reversal of 1621775463 is 3645771261.

It is a happy number.

It is not a de Polignac number, because 1621775463 - 2⁵ = 1621775431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621775413) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149770 + ... + 160232.

It is an arithmetic number, because the mean of its divisors is an integer number (57524096).

Almost surely, 2^1621775463 is an apocalyptic number.

1621775463 is a deficient number, since it is larger than the sum of its proper divisors (1139381145).

1621775463 is a wasteful number, since it uses less digits than its factorization.

1621775463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556 (or 10545 counting only the distinct ones).

The product of its digits is 211680, while the sum is 42.

The square root of 1621775463 is about 40271.2734216339. The cubic root of 1621775463 is about 1174.8891914216.

The spelling of 1621775463 in words is "one billion, six hundred twenty-one million, seven hundred seventy-five thousand, four hundred sixty-three".