1634920134978 has 64 divisors (see below), whose sum is σ = 3566930895360. Its totient is φ = 496546682112.

The previous prime is 1634920134949. The next prime is 1634920135007. The reversal of 1634920134978 is 8794310294361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1634920134949) and next prime (1634920135007).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23362176 + ... + 23432052.

It is an arithmetic number, because the mean of its divisors is an integer number (55733295240).

Almost surely, 2^{1634920134978} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1634920134978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1783465447680).

1634920134978 is an abundant number, since it is smaller than the sum of its proper divisors (1932010760382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1634920134978 is a wasteful number, since it uses less digits than its factorization.

1634920134978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73771.

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 1634920134978 in words is "one trillion, six hundred thirty-four billion, nine hundred twenty million, one hundred thirty-four thousand, nine hundred seventy-eight".