145978517099 has 4 divisors (see below), whose sum is σ = 149923882464. Its totient is φ = 142033151736.

The previous prime is 145978517089. The next prime is 145978517143. The reversal of 145978517099 is 990715879541.

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 145978517099 - 2¹² = 145978513003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145978517029) 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, 1972682627 + ... + 1972682700.

It is an arithmetic number, because the mean of its divisors is an integer number (37480970616).

Almost surely, 2^145978517099 is an apocalyptic number.

145978517099 is a deficient number, since it is larger than the sum of its proper divisors (3945365365).

145978517099 is an equidigital number, since it uses as much as digits as its factorization.

145978517099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945365364.

The product of its (nonzero) digits is 28576800, while the sum is 65.

The spelling of 145978517099 in words is "one hundred forty-five billion, nine hundred seventy-eight million, five hundred seventeen thousand, ninety-nine".