1645641534 has 16 divisors (see below), whose sum is σ = 3315308688. Its totient is φ = 544542912.

The previous prime is 1645641527. The next prime is 1645641553. The reversal of 1645641534 is 4351465461.

It is a junction number, because it is equal to n+sod(n) for n = 1645641492 and 1645641501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000177 + ... + 1001820.

It is an arithmetic number, because the mean of its divisors is an integer number (207206793).

Almost surely, 2^1645641534 is an apocalyptic number.

1645641534 is an abundant number, since it is smaller than the sum of its proper divisors (1669667154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645641534 is a wasteful number, since it uses less digits than its factorization.

1645641534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002139.

The product of its digits is 172800, while the sum is 39.

The square root of 1645641534 is about 40566.5075400878. The cubic root of 1645641534 is about 1180.6243784576.

The spelling of 1645641534 in words is "one billion, six hundred forty-five million, six hundred forty-one thousand, five hundred thirty-four".