40123123205445 has 96 divisors (see below), whose sum is σ = 79606143781632. Its totient is φ = 18313372256256.

The previous prime is 40123123205437. The next prime is 40123123205453. The reversal of 40123123205445 is 54450232132104.

It is a happy number.

40123123205445 is a `hidden beast` number, since 4 + 0 + 1 + 2 + 3 + 1 + 2 + 3 + 205 + 445 = 666.

It is an interprime number because it is at equal distance from previous prime (40123123205437) and next prime (40123123205453).

It is not a de Polignac number, because 40123123205445 - 2³ = 40123123205437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 532261597 + ... + 532336973.

It is an arithmetic number, because the mean of its divisors is an integer number (829230664392).

Almost surely, 2^{40123123205445} is an apocalyptic number.

40123123205445 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40123123205445 is a deficient number, since it is larger than the sum of its proper divisors (39483020576187).

40123123205445 is a wasteful number, since it uses less digits than its factorization.

40123123205445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78011 (or 78008 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 40123123205445 its reverse (54450232132104), we get a palindrome (94573355337549).

The spelling of 40123123205445 in words is "forty trillion, one hundred twenty-three billion, one hundred twenty-three million, two hundred five thousand, four hundred forty-five".