201520153551 has 16 divisors (see below), whose sum is σ = 269323740000. Its totient is φ = 134032005120.

The previous prime is 201520153493. The next prime is 201520153559. The reversal of 201520153551 is 155351025102.

It is not a de Polignac number, because 201520153551 - 2⁹ = 201520153039 is a prime.

It is a super-2 number, since 2×201520153551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201520153559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2405611 + ... + 2487971.

It is an arithmetic number, because the mean of its divisors is an integer number (16832733750).

Almost surely, 2^201520153551 is an apocalyptic number.

201520153551 is a deficient number, since it is larger than the sum of its proper divisors (67803586449).

201520153551 is a wasteful number, since it uses less digits than its factorization.

201520153551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84266.

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 201520153551 its reverse (155351025102), we get a palindrome (356871178653).

The spelling of 201520153551 in words is "two hundred one billion, five hundred twenty million, one hundred fifty-three thousand, five hundred fifty-one".