1645550101 has 8 divisors (see below), whose sum is σ = 1813343840. Its totient is φ = 1483643952.

The previous prime is 1645550089. The next prime is 1645550117. The reversal of 1645550101 is 1010555461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1645550101 - 2⁵ = 1645550069 is a prime.

It is a super-2 number, since 2×1645550101² = 5415670269802220402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645550101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645550131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471311 + ... + 1472428.

It is an arithmetic number, because the mean of its divisors is an integer number (226667980).

Almost surely, 2^1645550101 is an apocalyptic number.

It is an amenable number.

1645550101 is a deficient number, since it is larger than the sum of its proper divisors (167793739).

1645550101 is a wasteful number, since it uses less digits than its factorization.

1645550101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943795.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1645550101 is about 40565.3805726016. The cubic root of 1645550101 is about 1180.6025126126.

The spelling of 1645550101 in words is "one billion, six hundred forty-five million, five hundred fifty thousand, one hundred one".