1000172125078 has 48 divisors (see below), whose sum is σ = 1896310656000. Its totient is φ = 392985386640.

The previous prime is 1000172125049. The next prime is 1000172125079. The reversal of 1000172125078 is 8705212710001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000172125079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8605978 + ... + 8721421.

It is an arithmetic number, because the mean of its divisors is an integer number (39506472000).

Almost surely, 2^{1000172125078} is an apocalyptic number.

1000172125078 is a deficient number, since it is larger than the sum of its proper divisors (896138530922).

1000172125078 is a wasteful number, since it uses less digits than its factorization.

1000172125078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17327465 (or 17327458 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 34.

Adding to 1000172125078 its reverse (8705212710001), we get a palindrome (9705384835079).

The spelling of 1000172125078 in words is "one trillion, one hundred seventy-two million, one hundred twenty-five thousand, seventy-eight".