1606137645 has 64 divisors (see below), whose sum is σ = 3119731200. Its totient is φ = 688816128.

The previous prime is 1606137641. The next prime is 1606137667. The reversal of 1606137645 is 5467316061.

It is not a de Polignac number, because 1606137645 - 2² = 1606137641 is a prime.

It is a super-3 number, since 3×1606137645³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606137641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 628831 + ... + 631379.

It is an arithmetic number, because the mean of its divisors is an integer number (48745800).

Almost surely, 2^1606137645 is an apocalyptic number.

1606137645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1606137645 is a deficient number, since it is larger than the sum of its proper divisors (1513593555).

1606137645 is a wasteful number, since it uses less digits than its factorization.

1606137645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 1606137645 is about 40076.6471277226. The cubic root of 1606137645 is about 1171.1007355989.

The spelling of 1606137645 in words is "one billion, six hundred six million, one hundred thirty-seven thousand, six hundred forty-five".