145053537491 has 4 divisors (see below), whose sum is σ = 146384304000. Its totient is φ = 143722770984.

The previous prime is 145053537487. The next prime is 145053537511. The reversal of 145053537491 is 194735350541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145053537491 - 2² = 145053537487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145053533491) 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, 665383091 + ... + 665383308.

It is an arithmetic number, because the mean of its divisors is an integer number (36596076000).

Almost surely, 2^145053537491 is an apocalyptic number.

145053537491 is a deficient number, since it is larger than the sum of its proper divisors (1330766509).

145053537491 is a wasteful number, since it uses less digits than its factorization.

145053537491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330766508.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 145053537491 in words is "one hundred forty-five billion, fifty-three million, five hundred thirty-seven thousand, four hundred ninety-one".