1620526545 has 24 divisors (see below), whose sum is σ = 3064269312. Its totient is φ = 785709600.

The previous prime is 1620526543. The next prime is 1620526553. The reversal of 1620526545 is 5456250261.

1620526545 is a `hidden beast` number, since 1 + 62 + 0 + 52 + 6 + 545 = 666.

It is not a de Polignac number, because 1620526545 - 2¹ = 1620526543 is a prime.

It is a super-2 number, since 2×1620526545² = 5252212566099274050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620526543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1636401 + ... + 1637390.

It is an arithmetic number, because the mean of its divisors is an integer number (127677888).

Almost surely, 2^1620526545 is an apocalyptic number.

1620526545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620526545 is a deficient number, since it is larger than the sum of its proper divisors (1443742767).

1620526545 is a wasteful number, since it uses less digits than its factorization.

1620526545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3273813 (or 3273810 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1620526545 is about 40255.7641214274. The cubic root of 1620526545 is about 1174.5875226402.

The spelling of 1620526545 in words is "one billion, six hundred twenty million, five hundred twenty-six thousand, five hundred forty-five".