19146778157 has 16 divisors (see below), whose sum is σ = 20785226112. Its totient is φ = 17532365760.

The previous prime is 19146778153. The next prime is 19146778159. The reversal of 19146778157 is 75187764191.

It is not a de Polignac number, because 19146778157 - 2² = 19146778153 is a prime.

It is a super-2 number, since 2×19146778157² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19146778153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1280438 + ... + 1295304.

It is an arithmetic number, because the mean of its divisors is an integer number (1299076632).

Almost surely, 2^19146778157 is an apocalyptic number.

It is an amenable number.

19146778157 is a deficient number, since it is larger than the sum of its proper divisors (1638447955).

19146778157 is a wasteful number, since it uses less digits than its factorization.

19146778157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15668.

The product of its digits is 2963520, while the sum is 56.

The spelling of 19146778157 in words is "nineteen billion, one hundred forty-six million, seven hundred seventy-eight thousand, one hundred fifty-seven".