197781503922 has 126 divisors (see below), whose sum is σ = 470214905517. Its totient is φ = 62355429072.

The previous prime is 197781503893. The next prime is 197781503923. The reversal of 197781503922 is 229305187791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 110164911921 + 87616592001 = 331911^2 + 296001^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=314469.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (197781503923) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 322644888 + ... + 322645500.

Almost surely, 2^197781503922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197781503922

197781503922 is an abundant number, since it is smaller than the sum of its proper divisors (272433401595).

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

197781503922 is an frugal number, since it uses more digits than its factorization.

197781503922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 197781503922 in words is "one hundred ninety-seven billion, seven hundred eighty-one million, five hundred three thousand, nine hundred twenty-two".