145400691697 has 4 divisors (see below), whose sum is σ = 146052712960. Its totient is φ = 144748670436.

The previous prime is 145400691673. The next prime is 145400691719. The reversal of 145400691697 is 796196004541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 796196004541 = 7 ⋅113742286363.

It is a cyclic number.

It is not a de Polignac number, because 145400691697 - 2²⁷ = 145266473969 is a prime.

It is a super-2 number, since 2×145400691697² (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 (145400691607) 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, 326010297 + ... + 326010742.

It is an arithmetic number, because the mean of its divisors is an integer number (36513178240).

Almost surely, 2^145400691697 is an apocalyptic number.

It is an amenable number.

145400691697 is a deficient number, since it is larger than the sum of its proper divisors (652021263).

145400691697 is an equidigital number, since it uses as much as digits as its factorization.

145400691697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652021262.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 145400691697 in words is "one hundred forty-five billion, four hundred million, six hundred ninety-one thousand, six hundred ninety-seven".