145355520251 has 4 divisors (see below), whose sum is σ = 150367779600. Its totient is φ = 140343260904.

The previous prime is 145355520209. The next prime is 145355520283. The reversal of 145355520251 is 152025553541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152025553541 = 109 ⋅1394729849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145355520251 is a prime.

It is a super-2 number, since 2×145355520251² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145355520151) 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, 2506129631 + ... + 2506129688.

It is an arithmetic number, because the mean of its divisors is an integer number (37591944900).

Almost surely, 2^145355520251 is an apocalyptic number.

145355520251 is a deficient number, since it is larger than the sum of its proper divisors (5012259349).

145355520251 is an equidigital number, since it uses as much as digits as its factorization.

145355520251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5012259348.

The product of its (nonzero) digits is 150000, while the sum is 38.

The spelling of 145355520251 in words is "one hundred forty-five billion, three hundred fifty-five million, five hundred twenty thousand, two hundred fifty-one".