1620662471 has 4 divisors (see below), whose sum is σ = 1620882000. Its totient is φ = 1620442944.

The previous prime is 1620662453. The next prime is 1620662509. The reversal of 1620662471 is 1742660261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1742660261 = 61 ⋅28568201.

It is a cyclic number.

It is not a de Polignac number, because 1620662471 - 2¹⁰ = 1620661447 is a prime.

It is a super-3 number, since 3×1620662471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620692471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98291 + ... + 113588.

It is an arithmetic number, because the mean of its divisors is an integer number (405220500).

Almost surely, 2^1620662471 is an apocalyptic number.

1620662471 is a deficient number, since it is larger than the sum of its proper divisors (219529).

1620662471 is an equidigital number, since it uses as much as digits as its factorization.

1620662471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219528.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1620662471 is about 40257.4523659906. The cubic root of 1620662471 is about 1174.6203622791.

The spelling of 1620662471 in words is "one billion, six hundred twenty million, six hundred sixty-two thousand, four hundred seventy-one".