2001540315553 has 2 divisors, whose sum is σ = 2001540315554. Its totient is φ = 2001540315552.

The previous prime is 2001540315539. The next prime is 2001540315631. The reversal of 2001540315553 is 3555130451002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1139413209489 + 862127106064 = 1067433^2 + 928508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001540315553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001540315253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000770157776 + 1000770157777.

It is an arithmetic number, because the mean of its divisors is an integer number (1000770157777).

Almost surely, 2^{2001540315553} is an apocalyptic number.

It is an amenable number.

2001540315553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001540315553 is an equidigital number, since it uses as much as digits as its factorization.

2001540315553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 2001540315553 its reverse (3555130451002), we get a palindrome (5556670766555).

The spelling of 2001540315553 in words is "two trillion, one billion, five hundred forty million, three hundred fifteen thousand, five hundred fifty-three".