1655540001 has 6 divisors (see below), whose sum is σ = 2391335570. Its totient is φ = 1103693328.

The previous prime is 1655539999. The next prime is 1655540039. The reversal of 1655540001 is 1000455561.

It is a happy number.

1655540001 is a `hidden beast` number, since 1 + 655 + 5 + 4 + 0 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1516323600 + 139216401 = 38940^2 + 11799^2 .

It is not a de Polignac number, because 1655540001 - 2¹ = 1655539999 is a prime.

It is a super-2 number, since 2×1655540001² = 5481625389822160002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655540071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91974436 + ... + 91974453.

Almost surely, 2^1655540001 is an apocalyptic number.

It is an amenable number.

1655540001 is a deficient number, since it is larger than the sum of its proper divisors (735795569).

1655540001 is a wasteful number, since it uses less digits than its factorization.

1655540001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183948895 (or 183948892 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1655540001 is about 40688.3275768371. The cubic root of 1655540001 is about 1182.9867840762.

Adding to 1655540001 its reverse (1000455561), we get a palindrome (2655995562).

The spelling of 1655540001 in words is "one billion, six hundred fifty-five million, five hundred forty thousand, one".